Answer:
D
Explanation:
The alkali metals have the high thermal and electrical conductivity, lustre, ductility, and malleability that are characteristic of metals. Each alkali metal atom has a single electron in its outermost shell. This valence electron is much more weakly bound than those in inner shells.
Alkali Metals have higher reactivities. Therefore, option (B) is correct.
Alkali metals, including potassium and rubidium, differ from other metals primarily in terms of their reactivity. Alkali metals are highly reactive and readily react with other elements or compounds, especially water and oxygen. This reactivity is due to their low ionization energies and the tendency to lose their outermost electron to achieve a stable electron configuration.
In contrast, other metals may have lower reactivity or may require more energy to undergo chemical reactions. While the density, melting points, and electronegativities can vary among different metals, the characteristic that sets alkali metals apart is their high reactivity, which is a result of their electron configuration and the ease with which they can form positive ions.
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Why does water feel cool when it evaporates?
O Evaporation uses energy, and this heat energy is taken from the body.
O Evaporation gives up energy, and this heat energy is added to the body.
O Evaporation makes the air moist, which makes it feel cooler.
Answer:
i think its A
Evaporation uses energy, and this heat energy is taken from the body.
Answer:
Evaporation uses energy, and this heat energy is taken from the body.
Explanation:
Do you think atrazine should be used? Explain your reasoning
Atrazine is safe to use so far.
Standards could change if EPA rules atrazine is more hazardous to health than previously thought. Currently, EPA standards allow 3 parts per billion (ppb) or less of atrazine to be present in drinking water.
#5 Megan's lesson really mattered
Juan is making a chart to organize his notes about centipedes.
Which best completes the chart?
tear plants
dig
squirt liquid
inject poison
Answer:
inject poison
Explanation:
edge2021
Answer:
D
Explanation:
How can a poly genic trait be easily identified
Answer: The presence of the polygenic trait masks the other possible alleles involved. There are only two possible phenotypes for the trait. The graphing of the possible phenotypes results in a bell curve. Usually, traits are polygenic when there is wide variation in the trait. For example, humans can be many different sizes. Height is a polygenic trait, controlled by at least three genes with six alleles. If you are dominant for all of the alleles for height, then you will be very tall.
Explanation:
CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION I WILL MARK YOU BRAINLIEST THANK YOU !!!
Answer:
sedimentary basins hope it helps
Evolution is likely to occur in all of the following scenarios except
A.
in a rapidly changing environment
B.
in an environment with a lot of competition
C.
when food is abundant
D.
when the same antibiotic is used repeatedly
Answer: C. when food is abundant
Explanation:
The Earth has a magnetic field. If you were to use a bar magnet to represent the magnet causing the magnetic field, which representation would be correct? The Earth is shown with curved lines marked by arrowheads, which lead from the south geographic pole to the north. A bar magnet overlaid on Earth has S to the north geographic pole and N to the south. The Earth is shown with curved lines marked by arrowheads, which lead from the south geographic pole to the north. A bar magnet overlaid on Earth has N to the north geographic pole and S to the south. The Earth is shown with curved lines marked by arrowheads, which lead from the south geographic pole to the north. A bar magnet overlaid on Earth has S to the east along the equator and N to the west.
Answer:
A
Explanation:
Answer:
A
Explanation:
The frequency of genes that lead to favorable traits increases because
A.
favorable traits always start out as the rare form and become more common
B.
the genes for favorable traits are dominant over those for unfavorable genes
C.
Both B and D
D.
those genes continue on to the next generation when the individuals that contain the genes successfully survive and reproduce
Answer:
The answeer is both B and D.
A group of researchers are monitoring the health of a salt marsh. They
measure high levels of nitrates and phosphates in the sediment of the marsh
but not in the water samples. In this instance, which ecological service is the
marsh providing?
A. coastal land
B. Aquatic habitat
C.Flood protection
D. Water purification
Answer:
It is D
Explanation:
Trust me I've taken it already, and plus it talks about it not being in the water.
In the given instance, the ecological service which is providing the marsh is the water purification. Thus, the correct option will be D.
Ecological services or ecosystem services are the many and varied benefits which the humans are provided or get from the natural environment and the healthy ecosystems. Such ecosystems include, for example, the agroecosystems, forest ecosystem, grassland ecosystems, and also the aquatic ecosystems.
A group of researchers are monitoring the health of a salt marsh. They measure high levels of nutrients in the sediment but not in the water samples. In this instance, the ecological service which is providing marsh is the water purification.
Therefore, the correct option is D.
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I needd this now barinliest to first person
Which of the following statements about cell reproduction is true?
a.Mitosis is a form of sexual reproduction.
b.Meiosis is a form of asexual reproduction.
c.The cells produced by mitosis are genetically identical to parent cells.
d.The cells produced by meiosis are genetically identical to parent cells.
Answer:
d
Explanation:
The 2011 earthquake triggered a ... Question 3 options: hurricane volcano tsunami sand storm
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Which phase of cell division is shown?
A) prophase I of meiosis
B) telophase II
C) anaphase II
D) telophase I
Answer:D
Explanation: Hope it helps
Hi there,
What are the three limiting factors involved in photosynthesis???
:D
Answer:
light intensity, carbon dioxide concentration and temperature.
hope it helps:D
mark me as brainliest plz
Answer: light intensity, carbon dioxide concentration and temperature.
Explanation:
what impact does the environment have on the environment?
Answer:
The environment will impact positively if the human activities are positive and negative if the human activities are negative. It is worthy of note that our actions and activities contribute greatly to the way and manner our environment response to us.
which event would most likely lead to a thunder storm
i think the answer is (C)
Explanation:
The warm air becomes cooler, which causes moisture, called water vapor, to form small water droplets - a process called condensation. ... If this happens with large amounts of air and moisture, a thunderstorm can form.
musclers responsible
Plant and animals do not impact each other win natural selection ? True or false
Answer:
False
Explanation:
They do as certain animal species may need to eat certain plants, so if those plants weren't there, it could make the animals die
how is the sun a key component of the water cycle
Answer:
It warms the water on Earth's surface and causes it to change from a liquid water to a water vapor or gas.
The weather map shows air pressures in millibars.
1008
1004
1.004
1008 21004
1008
1004
Logs
-1000
1000
1000T
1-004
19.00 1000
2008
996
T004
2004.
2004
1008
Which set of conditions best describes the weather at the area of lowest air pressure?
O A.) Bright sun with no wind
O B.) Partly cloudy with no wind
O C.) Mostly sunny with light winds
O D.) Overcast skies with strong winds
Answer:
I think it is A.) Bright sun with no wind
Explanation:
It has no wind or clouds not a lot of air pressure.
Can I please have Brainliest?
Please select the word from the list that best fits the definition
Using known information to make a forecast of what will happen next
Answer:
The correct answer is - predicting.
Explanation:
In scientific method or investigation, prediction is what a person forecasts that will happen in the future on the basis of prior knowledge or information or if he knows or believes the hypothesis is true.
Prediction is made on the basis of the information scientist known already. A weather forecast is also a prediction made on the basis of known facts or information and hypothesis.
Answer:
predicting
Explanation:
Gas makes things buoyant, why ? And what are ways that this could be useful?
Answer:
Gas makes things buoyant by making the volume of an object lighter than the surrounding fluid it is trying to displace.
Gas Buoyancy is useful in the following ways;
• Airships
• Steel ships and
• All floating and flying vessels
Explanation:
Buoyancy is the tendency of an object to float in a fluid such as air or water. It is a phenomenon that was theorized by the mathematician, Archimedes known as the Archimedes Principle.
It states that the upward buoyant force that is exerted on a body immersed in a fluid is equal to the weight of the fluid that the body displaces.
The principle explains the reason why objects float and fly.
So, when an object is immersed in a fluid, it can float due to the upward force exerted by the fluid on the object. But for this to happen, the object has to weigh less than the fluid it is displacing.
This is where the use of a gas comes into play.
Because the object may be heavier than the surrounding fluid it is trying to displace, it is filled with a large amount of gas (usually hydrogen and/or helium) which is lighter. This makes the volume of the gas and the object put together lighter than that of the surrounding air.
This is what causes objects to float or fly
steps of photosynthesis
Answer:
The Six stepls of Photosynthesis
1. When Leaves open their pores which is known as stomata.
2. Sunlight enters in the leaves through open pores.
3. Sunlight absorbed minerals from Carbon dioxide and water.
4. Absorbed minerals converted into glucose.
5. Glucose will change in green color pigment known as cholorophyll.
6. This process may also convert carbon dioxide into oxygen.
1.Write the equation for light dependent reaction of photosynthesis
2.Write the Equation for light independent reaction of Calvin cycle?
Answer:
1. The overall chemical equation of the light-dependent reactions is given below:
12 H₂O + 12 NADP+ + 18 ADP + 18 Pi + light and chlorophyll ----> 6 O₂ + 12 NADPH + 18 ATP
2. The overall chemical equation for the light-independent reactions of the Calvin cycle is given below :
3 CO₂+ 6 NADPH + 5 H₂O + 9 ATP → glyceraldehyde-3-phosphate (G3P) + 2 H+ + 6 NADP+ + 9 ADP + 8 Pi
Explanation:
1. The light-dependent reactions convert light energy into chemical energy, producing ATP and NADPH which are used light-independent reactions to drive the synthesis of sugar molecules from inorganic CO₂ and water. Light-dependent reactions takes place in photosystem I and II. Photosystem I and Photosystem II ( PS I and PS II) are the two biochemical systems, active in chloroplasts, that serve as sites of electron transfer reactions in photosynthesis. Energy from sunlight is used to split water which releases electrons and hydrogen atoms which are transferred to NADP+ to produce ATP and NADPH and oxygen is produced as a waste product.
The overall chemical equation of the light-dependent reactions is given below:
12 H₂O + 12 NADP+ + 18 ADP + 18 Pi + light and chlorophyll ----> 6 O₂ + 12 NADPH + 18 ATP. Note that Pi refers to inorganic phosphate
2. The Calvin cycle refers to the light-independent reactions in photosynthesis. It occurs in three stages.
Stage 1 (Carbon fixation): In this first stage of the Calvin cycle, light-independent CO₂ is fixed by enzyme called ribulose bisphosphate carboxylase (RuBisCO) to ribulose bisphosphate (RuBP) to form glyceraldehyde-3-phosphate.
Stage2: ATP and NADPH are used to reduce 3-phosphoglycerate (3-PGA) into glyceraldehyde--phosphate (G3P). ATP and NADPH are used up in the process and are converted to ADP and NADP+, respectively.
Third stage: RuBP is regenerated, which enables the system to prepare for more CO2 to be fixed.
The overall chemical equation for the light-independent reactions of the Calvin cycle is given below :
3 CO₂+ 6 NADPH + 5 H₂O + 9 ATP → glyceraldehyde-3-phosphate (G3P) + 2 H+ + 6 NADP+ + 9 ADP + 8 Pi
When trrowing a ball why does the triceps muscle contract?
Answer:
The contraction of the triceps muscle causes the arm to flex. The contraction of the triceps muscle causes the arm to extend. When added to the force of the biceps contracting it provides extra force to the ball.
View the slides on the PowerPoint to match each of the cell structures with the correct letter labels for each of the following cells. Elodea Cell Cell wall _____ Chloroplast ____ Area of vacuole ___ Onion Cell Cell wall ___ Nucleus ___ Mitochondria ___ Cheek Epithelial Cell Cell membrane ___ Nucleus ___ BacteriA Bacterial Cells. View the bacterial cells on the PowerPoint and identify which cell (A, B, or C) is: Coccus ____________ Bacillus ____________ Spirillum ____________ Protista Amoeba can move via the extension of finger-like projections called pseudopodia, what prevents plant cells from moving in the same fashion? How does the euglena compare to both plant and animal cells (i.e. - explain what structure(s) might make it similar to plants and what structures might make it similar to animals).
Answer:
10. View the slides on the PowerPoint to match each of the cell structures with the correct letter labels for
each of the following cells.
Elodea Cell Cell wall _B____ Chloroplast _A___ Area of vacuole _C__ Onion Cell Cell wall _B__ Nucleus __A_ Mitochondria _C__ Cheek Epithelial Cell Cell membrane _B__ Nucleus __A_ BacteriA Bacterial Cells. View the bacterial cells on the PowerPoint and identify which cell (A, B, or C) is: Coccus ________B____ Bacillus ______A______ Spirillum ______C______ Protista Amoeba can move via the extension of finger-like projections called pseudopodia
Explanation:
Amoeba can move via the extension of finger-like projections called pseudopodia, what prevents plant cells from moving in the same fashion?
Ans: The plants that prevent the information of pseudopodia have rigid cell walls. which is unlike to amoeba.
How does the euglena compare to both plant and animal cells (i.e. - explain what structure(s) might make it similar to plants and what structures might make it similar to animals).
Ans: Euglena are similar to plants because they both have chloroplast and are similar to animals because neither has a cell wall.
Which of the following best illustrates the idea of Survival of the Fittest?
A.
The strongest ant in the colony always gets the most mates.
B.
The strongest cow always eats the most grass.
C.
A slower cheetah is able to obtain more food than others because it is able to catch the slower deer while the faster cheetah goes after the fastest deer.
D.
The largest mouse always wins even though it is more easily seen by predators.
Answer:
The correct answer is - Option A. The strongest ant in the colony always gets the most mates.
Explanation:
The survival of fittest is the idea that is developed from the theory of evolution proposed by Darwin in his book Origin of Species. This phrase is used to explain the mechanism of natural selection. According to natural selection which is a process the species that adapt the ecological changes in order to survive and reproduce themselves, carry the traits to the next generation.
The ant colony has different classes on the basis of their role and strength. The queen is most strong ant that can produce offspring by mating with most of the mates.
Serpins are naturally occurring proteins that serve as serine protease inhibitors. Serpins bind to the enzyme and are cleaved, but the acyl enzyme intermediate cannot behydrolyzed leading to irreversible inhibition. One of the serpins is a potent inhibitor of the serine protease trypsin and, as expected, contains an arginine at the site of cleavage. Using arrows to show the flow of electrons, draw the mechanism for theinhibition of trypsin by this serpin, labeling all intermediates. Draw the side chains of important enzyme amino acids, and show all hydrogen bonding within the enzyme-substrate complex. Also be sure to include the important arginine on the inhibitor including its side chain.
Answer:
Explanation:
The serpins are components of human plasma and its mutations result in numerous genetic diseases, such as caused by the deficiency of α 1 -antitrypsin. They are proteins of high molecular mass (350-500 amino acids) and have been identified in numerous organisms, from viruses to mammals. The serpins interact with the target enzyme by a similar mechanism on a substrate, although an irreversible interaction where the bond occurs serpin adopts different conformations to interact with the protease target, causing a deformation of the active site of the protease.
The mechanism of inhibition of Trypsin by serpin can be seen in the image below.
Roger Sperry cut a newts optic nerve and rotated the eye. Axons from what used to be the dorsal part of the retina (now located on the ventral side) grew back to the target areas: Select one: A. that ordinarily get input from the ventral retina. B. equally and diffusely. C. that ordinarily get input from the dorsal retina. D. that ordinarily get input from the center of the retina.
Answer:
C
Explanation:
that ordinarily get input from the dorsal retina
PLEASE HELP !! ILL GIVE 40 POINTS ; PLUS BRAINLIEST !! DONT SKIP ANSWER.
Answer:
angle PQN and angle ONQ are alternate interior angles