Answer:
about 3.7 billion years
The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.
Explanation:
hope it will help you
Multiple choice please help, will give brainliest!
If a pedigree is Sex-linked that means
a.) only males can be carriers
b.) females can never get the disease
c.) females are always the carriers
d.) it is carried on the Y chromosome
Answer:
you don't answer me hello am I going to be mark brainliest this is the correct answer I just got done working on this and my son got it correct it is your answer is C females are always the carriers .
Explanation:
your explanation females cuz they have two X chromosomes which means they can be a carrier for a sex-linked trait . Please mark me brainliest
what is commensalism?
Answer:
an association between two organisms in which one benefits and the other derives neither benefits nor harm
Explanation:
A frog using a plant as protection
Answer:commensalism is a symbiotic relationship where one organism benefits and the second is neither harmed nor helped ..
Explanation:
Explain How does the gradient of a river affect
its flow?
Explanation:
The flow of the river is dependent upon the position along the stream in terms of the gradient. Near the top of a high gradient, the flow will be less than that near the bottom. Likewise, the steeper the river's gradient, the faster the flow of water (due to the pull of water down the gradient by gravity).
what does a microscope enable people to do
A microscope enables people to magnify things up close that you cannot see with the human eye. Many people have found extraordinary things through the telescope, up to 6,500 times up close (world record microscope). They are used in almost every research center.
In DNA what is the complementary strand to GGACG?
Answer:
CCTGC
Explanation:
Adenine (A) and Thymine (T) are base-pairs whilst Cytosine (C) and Guanine (G) are base-pairs as well. Although they only go in the order A-T and C-G, you will never see Adenine and Cytosine together on a DNA strand.
What are the types of asexual reproduction? Describe each.
Which are the building blocks of carbohydrates?
amino acids
fatty acids
proteins
O glucose
Proteins are the building blocks of carbohydrates
How do Punnett squares help predict the outcomes of artificial selection?
Punnett squares can be used to combine the alleles from the mother and the father to ascertain the likelihood as well as potential genotypes and phenotypes that a child may acquire from their parents.
What are Punnett squares?
The Punnett square is a tabular summary of possible combinations of maternal elapse with paternal. The percentages of phenotypes in a cross's progeny from known genotypes can be predicted using a Punnett square.
Based on the other genotypes involved in the cross, a missing genotype can be identified using a Punnett square. A Punnet square displays the potential gene combinations in the child inside the square, together with the genes (represented by letters) in the parent gametes along the top and left sides of the square.
Therefore, Punnett squares can be completed to determine the likely outcome of a cross.
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Explain why the size of a new moon would affect the appearance of a solar eclipse.
Answer:
A solar eclipse can occur only when new moon occurs close to one of the points (known as nodes) where the Moon's orbit crosses the ecliptic. ... Therefore, the Moon's apparent size varies with its distance from the Earth, and it is this effect that leads to the difference between total and annular eclipses.
Compare the 5 mechanisms of evolution. In your opinion, which one has the LEAST impact on a population? Justify your answer
Answer:
Selah yes and all
Explanation:
Selah and the thousands of people are going through a lot and I think they will make
Why is cellular respiration so
important to cells?
A. Without it the cells would have no energy.
B. It provides the cell with oxygen.
C. It removes all of the waste that builds up in a cell.
Answer:
C. It removes all of the waste that builds up in a cell
(Giving Brainliest) An energy transformation is when energy changes from one form to another.
Group of answer choices
True
False
Answer:
The answer is true.
Explanation:
You cannot create or destroy Energy. It can only be transformed from one form to another.
If a second cross is made using these offspring and results are ¾ short haired while ¼ are long haired can you now determine the exact genotypes of the parents and if so what are they?
Complete question:
In guinea pigs, the allele for short hair is dominant. All the guinea pigs are born short-haired. If a second cross is made using these offspring and results are 3⁄4 short-haired while 1⁄4 are long-haired can you now determine the exact genotypes of the parents and if so what are they?
Answer:
The exact genotype of both the F2 parents is Ss, heterozygous for the trait hair length.
Explanation:
Due to technical problems, you will find the complete answer and explanation in the attached files
( DO NOT ANSWER IF U DO NOT KNOW PLEASE, URGENT ) Do the following exercise, showing all your calculations. 1. a) Compare the speed that light waves travel in air to the speed that sound waves travel in the air. (Show results in meters/second) Comment: b) How many times faster do light waves travel in air in comparison to sound waves in air? Show your working out and answer here: 2. Compare the speed of light in water to the speed of sound in water.(Show results in meters/second) Comment:
Answer:
This is physics. Not biology. Just search up the speed of sound and light and divide the two numbers to see how many times faster light waves are. Do the same thing for the water.
answer these for brainlist and extra points!! ♥️
Can someone please answer my last question?????
can anyone help me with this question?
how do enzymes affect activation energy in a chemical reaction
Answer:
Enzymes lower the activation energy that is needed, making reactions happen at a lower temperature that they could without the enzyme. This speeds up the rate of reaction.
Explanation:
Answer:
they speed up the chemical reaction
I need help fast, please and thank you.
Amy hikes down into the Grand Canyon to see Havasu Falls, a waterfall famous for its blue-green water and rock formations.
How does water shape Earth’s surface? What is the main way the hydrosphere interacts with the geosphere at Havasu Falls? Explain how this process forms waterfalls.
Basically when water goes over the earth it corrodes it and in that way shapes the earth's surface. The hydrosphere corrodes the gyoshere at Havasu Falls.
The hydrosphere is interacts with the geosphere at Havasu falls via Erosion. The erode of waterfalls softer surface of the rocks that leads to shaping the Earth's surface.
What is Geosphere?
The geosphere is the layer of Earth which consists of solid rock and other rocky materials. In contrast it could be said that the geosphere is a part of the physical, solid Earth which excludes hydrosphere (i.e. oceans, lakes, and rivers) or the atmosphere (the layer of gases that separates the ground from space).
The term geosphere is basically the the crust portion of earth, as the crust elucidates the outer layer of earth's rigid portion.
The geosphere is basically all about processes, the rock cycle processes consisting of metamorphism, melting and solidification, weathering, erosion, deposition, and burial, these constant process are responsible for the recycling of rocks on Earth between sedimentary, igneous, and metamorphic states.
Thus, the hydrosphere is interacts with the geosphere at Havasu falls via Erosion. The erode of waterfalls softer surface of the rocks that leads to shaping the Earth's surface.
Learn more about Geosphere, here:
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Which food chain correctly summarizes the order of energy flow in an ecosystem?
A. sun --> zooplankton --> shrimp --> bass
B. sun --> daisy --> caterpillar --> mockingbird
C. sun--> shelf fungus --> pig --> wolf
D. sunflower --> blue jay --> rattlesnake --> red-tailed hawk
Answer:
thats just tooo bad
Explanation
Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. A purple center outlined in black with two concentric black circles around the center, the inner circle having 2 small green balls on it and the outer circle having 8 small green balls on it. What experimental evidence led scientists to change from the previous model to this one?
Answer:
A few of the positive particles aimed at a gold foil seemed to bounce back.
Explanation:
Some of the positive particles aimed at a gold foil seemed to bounce back which gives information to the scientists that some heavy particles present in the center of the atom which bounce back the positive particles. so from this evidence the scientists says that atom is divisible and having subatomic particles such as proton, electron and neutron. Proton and neutron is present in the center whereas electron is revolving around the nucleus of an atom.
Answer:
I don't have an exact answer.
Explanation:
Anyone who bothers to use the answer above me, DON'T! It's an inncorrect answer. I lost my 100% in my class for that answer alone so it is either (A. (C. (D.
In the equation H2 + O2 --> H2O, H2O is the
product
gas
reaction
equation
Answer: the product
Explanation:
Answer:
product
Explanation:
What types of cells does it take place in cellular respiration?
Answer:
Every cell
Explanation:
A single cell of testis divides to produce:
a. 4 sperms.
b. 6 sperms.
c. 2 sperms.
d. a single sperm.
Answer:
Each primary spermatocytes goes through the first meiotic division, meiosis I, to produce two secondary spermatocytes, each with 23 chromosomes (haploid). Just prior to this division, the genetic material is replicated so that each chromosome consists of two strands, called chromatids, that are joined by a centromere.
Answer:
Assertion In the testis, spermatogenesis occurs in the seminiferous tubules and testosterone secretion takes place from the Sertoli cells. Reason Testosterone brings growth and maturation of secondary s3x organs and also the development of accessory s3x characters.
Explanation:
Someone help me match the last two with their definition?
Diffusion and facilitated diffusion
Answer:
Explanation:
3. diffusion
4. facilitated diffusion
Heredity is the passing on of traits from parent to offspring. Heritable information is important for life to continue. What is the role of meiosis in heredity?
Write your answer in the space below.
Answer:
Meiosis helps create more diversity and individuality in the genes of organisms.
Explanation:
Hope this is helpful, this is what I learned last year.
Answer:Sexual reproduction allows for the passing of traits from parent to offspring. In sexual reproduction, meiosis produces gametes that have chromosomes from the parents. The chromosomes carry genetic information. When the gametes fuse during fertilization, an individual with a unique combination of chromosomes or a unique genetic make up is formed.
Explanation:this is the sample response on edge
In a certain population of rabbits the allele for brown fur is dominant over the allele for white fur if 10 out of 100 rabbits have white fur what is the allele frequency for the dominant allele
A) 0.68
O
B) 0.10
O
C) 0.95
O
D) 0.90
Answer:
0.90
Explanation:
Helppppp........!ASAP
Answer:
E. Confident
Explanation:
Holding eye contact, having firm movements and a strong voice are all clear indictators of a sense of self-confidence.
Answer:
I'm pretty sure it's e sry if I get it wrong
someone please thoroughly explain lac operon and trp operon
Thanks
Answer:
Like the lac operon, the trp operon is a negative control mechanism. The lac operon responds to an inducer that causes the repressor to dissociate from the operator, derepressing the operon. The trp operon responds to a repressor protein that binds to two molecules of tryptophan.
PLEASE ANSWER, IM BEING TIMED! GIVING 30 POINTS! WILL MARK BRAINLIEST TO A CORRECT ANSWER!
In human genetics, the allele for having freckles is inherited apart from the allele for having attached earlobes. Which one of Mendel's principles does this illustrate?
A- Principle of Alleles
B- Principle of Dominance
C- Principle of Independent Assortment
D- Principle of Segregation
Explanation:
The answer is B., because if freckles are a dominate trait between a female with freckles and a male with freckles, they're offspring will have a dominant trait of freckles..
Mendel's principle that describes this condition is known as the Principle of Independent Assortment. Thus, the correct option for this question is C.
What is the Principle of Independent Assortment?The Principle of Independent Assortment states that the two factors of each character separate out independently of the factors of the other characters at the time of gamete formation.
They get randomly rearranged in the offspring producing both parental and new combinations of new characters. According to the question, freckles are dominant over no freckles and unattached earlobes are dominant over attached earlobes.
This states that the factors of each character separate out independently. That is why the genes of these characters are not linked or associated with each other.
Therefore, the correct option for this question is C.
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Hi PLS HELPP: 15 points