True or false? pollen grains are the female gamete in the plant.
Answer:
True
Explanation:
Pollen consists of one or more vegetative cells and a reproductive cell. A pollen grain itself is not the male gamete. In angiosperms and certain gymnosperms, the vegetative cell forms the pollen tube that grows to meet the unfertilized ovules, and the reproductive cell is the source of the sperm.
A scientist is studying the age structure of a small country, which is shown in the following diagram.
This graph charts the ages of the population of Nger of both men and women. There are much more young people than old people across both genders.
Which conclusion does the diagram most strongly support?
A. The population of the country is increasing at a rapid rate.
B. The population of the country is relatively stable, and neither increasing nor decreasing significantly.
C. In 50 years, about 20 percent of the population will be ages 0 to 4.
D. In 50 years, about 20 percent of the population will be ages 50 to 54.
Answer:
A :The population of the country is increasing at a rapid rate.
Explanation:
trust :)
1. what is the pattern of expression for autosomal genes?
2. what are the patterns of expression for s3x-linked genes?
fill the diagram please
Answer:
1 head
2 neck
3 I am not sure yet
The most abundant bulk elements that make up the vast majority of living organisms are:.
Answer:
Carbon, oxygen, and hydrogen.
Answer:
The answer is oxygen, carbon and hydrogen
Explanation:
.
Wood project
Is this slime mold?
Yes, that is slime mold.
Answer:
Affirmative, that is slime mold.
an avalanche in the top of the Andes Mountains drastically reduces the population of conifers and mountain goats in an area. This is an example of a _____ environmental change
An avalanche reducing the populations of conifers and mountain goats is an example of natural environmental change.
What is an environmental change?This refers to sudden and often unexpected modification in factors such as weather, access to resources, among others.
What are the types of environmental changes?These changes can be classified into categories such as:
Natural environmental changes.Human-cause environmental changes.Based on this classification, the avalanche is a natural environmental change considering this is a natural disaster.
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Based on this excerpt, which of the following questions would best direct an investigation on whether the "informational polymer" is DNA or RNA?
Which functional groups are located at the 3’3’3, ’ and 5’5’5, ’ ends of informational polymer?
(Choice B)
B
Which purines are present in the structure of the informational polymer?
(Choice C)
C
Which five-carbon sugar is present in the structure of the informational polymer?
(Choice D)
D
Which phosphate group is present in the structure of the informational polymer?
The type of five-carbon sugar that is present would best direct an investigation on whether the "informational polymer" is DNA or RNA.
What are DNA and RNA?DNA and RNA are two different types of nucleic acids, which are composed of different building blocks.
In RNA, Thymine nucleotide bases are replaced by Uracil bases (both are pyrimidine nucleotides).
In DNA, the sugar is a deoxyribose pentose, whereas in RNA the pentose sugar is called ribose.
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Which of the following explains why animals need more food when it is cold?
What is the difference between force and net force?
Don't copied from goo-gle
Force
- Force is defined as the act of pushing or pulling of an object. It can influence and alter the motion of an object.
Net Force
- Unlike Force which only defines a push or pull, Net Force is the combination of all forces acting on an object. The Net Force can be computed through Newton's Second Law, F=ma.
If I accidentally cited false information, I am open to corrections :).
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More efficient plumbing reduces water pollution by _______.
a.
using more water
b.
using less water
c.
using cleaner water
d.
using dirty water
Please select the best answer from the choices provided
A
B
C
D
lets r-p
Answer:
Explanation:
You have two good reasons for good plumbing
Clean waterUsing Less water.Plumbing also includes things like waste disposal. Modern toilets for example use less water.
Health and well being are important. Good plumbing increases your chances of the water being clean and germ free.
I don't know which answer to pick. I think well being is more important than using slightly less water.
Answer: C
Answer:
B
Explanation:
Are there any parts of the human body that get oxygen directly from the air and not from the blood? Are there nuclear reactions going on in our bodies?
Answer:
The cornea is the only part of a human body that has no blood supply; it gets oxygen directly through the air. The cornea is the fastest healing tissue in the human body, thus, most corneal abrasions will heal within 24-36 hours.
Nuclear reactions do indeed occur in the human body, but the body does not use them.
Who first observed bacteria in 1676?
A.
Antoine van Leeuwenhoek
B.
Madame Curie
C.
Albert Einstein
D.
Carl Linnaeus
Antoine van Leeuwenhoek
if two organisms have the same name in it does it mean they are closely related?
Answer:
yes
Explanation:
similar structure can indicate relatedness
Richard Pyle turned to Bill Stone when he wanted to learn more about rebreathers and other diving technology.
OA. True
OB. False
Answer:
True
Explanation:
Protostomes that have bilateral symmetry and three embryonic germ layers, but that do not possess a coelom or pseudocoelom, are called
Flatworms are free-living or parasitic animals, with bilateral symmetry, triblastic and with no coelom. The correct answer is FLATWORMS.
What are the flatworms?These are animals of variable size, going from a few millimeters to centimeters.
Flatworms are bilateral, acoelomated, and triblastic animals. The fact of being acoelomate means that they lack an internal cavity. Their whole body is solid, having mesenchyme where different organs are located.
Sense organs are located in the anterior part of the body.
These animals are hermaphrodites, exhibiting cross reproduction and eventually autofecundation.
They might be free-living animals or parasitic.
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How is the reproductive rate of marine mammals
related to their status in regards to extinction?
Answer:
The fewer fish the less that can reproduce.
Explanation:
marine mammals with a slower reproductive rate are especially sensitive to disturbance , environmental changes and anthropogenic sources of stress because when populations of these organisms decline, recovery is especially slow . it takes a significant amount of time for these animals to reach reproductive maturity and they are commonly heavily invested in raising only one or two young ones every two to three years on average . therefore , populations of marine mammals with slow reproduction are in imminent danger when multiple sources of envirnmental pressure are acting in tandem over an extended period of time . The fewer fish the less that can reproduce.
More the reproductive rate, lesser the extinction and lesser the reproductive rate, more is the extinction.
What is reproductive rate?
The reproduction rate measures the conditions under which generations are replaced. This calculation can be made taking account of mortality (net reproduction rate) or without mortality (gross reproduction rate).
What is extinction?Extinction is a situation in which something no longer exists.
When the reproductive rate of marine mammals will be less, they will not be able to cover up the loss/death of their species caused by any reason and will ultimately lead to extinction.
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8. After learning about Walker and her love of and exploration of galaxies, what questions do you still have? What do you want to know more about?
After learning about Walker and her love of and exploration of galaxies, the most questions often ask is how these galaxies came into existence.
How these galaxies came into existence?Galaxies are known to be the product of a start of small compositions or clouds of stars and dust that are said to have been moving about through space.
Conclusively, Note that as other different clouds tries to get close, gravity is known to be the force that sends these objects scattering into each other then they mix up together to form a bigger spinning packs known as Galaxies
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In this illustration, the rings around the Sun represent
A)
orbits.
B)
sun rays.
C)
radiation.
D)
dust particles.
Answer:
I think the answer is C. radiation
Explanation:
Radiation is around the rings and makes some type of weather.
A scientist discovers a cell that has chloroplasts, cytoplasm, DNA, and a cell membrane. Which statement best describes how the cell could be classified?
The cell is prokaryotic because it has DNA.
The cell is prokaryotic because it has cytoplasm.
The cell is eukaryotic because it has a cell membrane.
The cell is eukaryotic because it has chloroplasts.
The Convention on the Protection and
Use of Transboundary Watercourses and
International Lakes of 1992 established
laws to govern all water that transect the
U.S
A. and the Bahamas
B. and Canada
C. and Hawaii
D. and Russia
Answer:
B. and canada
Explanation:
Sana po itoy maka tulong
What is a primary function of the corpus callosum?.
Answer:
The corpus callosum is a thick bundle of nerve fibres that ensures both sides of the brain can communicate and send signals to each other.
How much urine is produced by the kidneys each day?.
Answer:
Every day, your kidneys filter about 120 to 150 quarts of blood to remove wastes and balance fluids. This process produces about 1 to 2 quarts of urine per day.
what are kupffer cells in liver explain briefly
I’ll give Brainliest
Answer:
there all mamils
they all have 6 different bones on there lim
because they all look to be the same 5 fingers
becuase it is supposto mean that we are all related
Hope This Helps
Rabbits can exhibit a number of colors in their coats: black, white, tan, brown, red, and grey. A disease randomly kills off most of the population and leaves only black and grey rabbits. Future generations are only black or grey. What is the term used to describe this
phenomenon? (1 point)
1. artificial selection
2. genetic drift
3. natural selection
4. genetic modification
please hurry and I will mark brainliest!
Answer:
2. Genetic Drift
Explanation:
Because it's simply by chance not on purpose or because their stronger.
Term used to describe the phenomenone where only black and grey rabbits survive and rest are killed randoml is called Genetic Drift..
What is genetic drift?As a result of a chance or random event, the frequency of an allele in a population drifts over time compared to the frequency of the other alleles. this is termed as genetic drift. Here, the rabbits with other coat colors were randomly killed off due to the disease which increased the frequency of the black and grey coat allele and hence the population drifts from multicolored coats to only black and grey colored rabbit coats.Hence the correct option here will be 2. Genetic Drift
other options are incorrect because:
Artificial selection is inducing the desired traits artifically which is not possible because the disease was a random event and not induced by humans.Natural selection is the survival of the fittest of the alleles and elimination of less fitter alleles. here it is not mentioned whether Black and grey coats were more fitter to survive than other coatsGenetic modification is a human made procedure and did not occur here.learn more about Genetic Drift here:
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which of the following is NOT a natural resource?
O gold
O water
O oil
O fire
Answer:
oil
fire gold and water are all naturally from earth, oil is not.
l The movement of land masses during the history of the Earth.
Answer:
The movement of the plates sometimes leads to earthquakes and tsunamis.
Which biological process has genetic variation as a natural advantage?
budding
as_xual reproduction
s_xual reproduction
binary fission
Answer:
S**ual reproduction
Explanation:
mixing of DNA from two different germ cells
Which of the following is a genotype for an individual heterozygous for a trait?
a. Rr
b. tt
c. YY
d. Pr
Answer:
A. Rr
Explanation:
A. has the same phenotype
D. has different prototypes