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kipiarov [429]
2 years ago
6

What are fossils and how do scientists use them to understand evolution.

Biology
1 answer:
bonufazy [111]2 years ago
4 0

Hello User!

Answer:

Fossils document the existence of now-extinct species, showing that different organisms have lived on Earth during different periods of the planet's history. They can also help scientists reconstruct the evolutionary histories of present-day species.

Explanation:

Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today. ... Paleontologists can determine the age of fossils using methods like radiometric dating and categorize them to determine the evolutionary relationships between organisms

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What are the stages of the process of cleavage? Write the correct sequence
babunello [35]

Answer:

Cleavage is a process in which cell is divided into several parts without increasing in size. There are 4 stages of cleavage i. e. 2-cell, 4-cell, 8-cell and 16 cell stages. 2 cell embryo cleavage occurs after 30 hours of fertilization. 4 cell embryo cleavage occurs after 48 hours. 6 cell embryo cleavage occurs on third day of fertilization. 8 cell embryo cleavage occurs on fourth day of fertilization and more than 100 cells are formed.

7 0
3 years ago
In Whitetail deer, there is a gene for coat color. Brown coats (B) are
ahrayia [7]

Answer: All of the offspring are brown. The chances of getting a brown deer is 100%.

Explanation: The buck is homozygous dominant, meaning he has two of the brown (B) allele. The doe is white, and since the allele for a white coat is recessive, it has to have two white (b) alleles.

Set up a Punnett square with BB on one side and bb on the other. The results of this are 4 offspring all with the genotype Bb. Because brown (B) is dominant, all of them are brown.

To find the chance of getting a brown deer, take the number of brown deer (4) and divide it by the total number of outcomes (4). This gets you 4/4 or 1. As a percent, that would equal 100%.

4 0
3 years ago
Which statement describes the function of the plasma membrane?
MrRa [10]
<span>B, it recognizes substances and other cells it comes in contact with.</span>
3 0
3 years ago
Read 2 more answers
DNA Base Pairing Worksheet
erastovalidia [21]

Answer: 1. CCGTAAGCGCTAGTAC

2.GCAATCGTACGAAGTA

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Explanation: you just flip the letters with their corresponding ones

5 0
2 years ago
Which of the following are part of the body’s first line of defense against pathogens?
Fed [463]

The answer is "D"

The body's first line of defense is also known as Innate immunity and incudes mucous membranes. Both the intact skin and mucous membranes of the body offer a high degree of protection against pathogens.

 A good example is the mucous membrane of the respiratory tract. It is lined up with cilia and covered with mucus. The coordinated beating of the cilia drives the mucus up to the nose and mouth where the trapped bacteria can be expelled.

(Lymph nodes and white blood cells belong to the second line of defense, not the first) 

3 0
3 years ago
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