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PIT_PIT [208]
3 years ago
13

At the end of which period on the geological time scale did the dinosaurs become extinct? A. Jurassic B. Quaternary C. Cretaceou

s D. Tertiary
Biology
2 answers:
matrenka [14]3 years ago
7 0
<span>Hey, Rockstar2405!The dinosaurs become extinct in the Cretaceous Period. I <span>hope this helps;)</span></span>
pychu [463]3 years ago
5 0
(C. The dinosaurs became extinct after the Cretaceous time period, after living on Earth for about 165 Million Years
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Fish must have oxygen in the water to survive. How would a decrease in oxygen affect the fish in the aquarium? The variety of fi
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Answer:

<em>The number of fish would decrease.</em>

Explanation:

Ecological hypoxia can be described as a condition in which the oxygen level drops to such low levels in the aquatic ecosystem that it is no longer able to support aquatic life. In such a condition, the number of fishes declines at a rapid rate because fishes require oxygen as an essential element. Also, those fishes which do not have better adaptations to survive might get totally wiped out from the aquatic ecosystem.

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3 years ago
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How do the structure of adenine and
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Adenine forms two hydrogen bonds with thymine in DNA while three hydrogen bonds are formed between guanine and cytosine.

Thymine and cytosine are pyrimidines because they have a single ring structure. Adenine and guanine are purines because they have a double ring structure.
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3 years ago
What is the purpose of the cell membrane
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8 0
3 years ago
Need all the answers will give 5 stars.
bulgar [2K]

Answer:

1. "a, O, and J"

2. "R and C"

3. I'm not entirely sure about #3, but I believe the answer is "d and R"

4."J, K, I, M, N"

5. "d"

6. "I" explain why: "It is at the bottom, so it is therefore the oldest."

7. "Q" explain why: "It is at the top, so it is therefore the youngest."

8. The folding occured before the faulting. Why? Because the folding is evident in the second half of the fault.

<u><em>DISCLAIMER: any of these answers could be wrong. I did my best but I am still human.</em></u>

7 0
2 years ago
Consider the following three populations of birds. Assume HW equilibrium. With these birds red coloring is recessive, while brow
bixtya [17]

Answer:

Red allele frequency will be highest in population II

Population III can undergo bottleneck effect

The frequency of the brown allele will  least likely be altered in the population I

Explanation:

Population I -

Total population - 670

Brown birds - 603

Red birds - 67

Population II

Total population - 100

Brown birds - 90

Red birds - 10

Population III

Total population - 30

Brown birds - 27

Red birds - 3

Frequency of red birds in population I

\frac{67}{670} = 0.1

Frequency of red birds in population II

\frac{10}{90} = 0.11

Frequency of red birds in population III

\frac{3}{30} = 0.1

Red allele frequency will be highest in population II and it will be equal to \sqrt{0.11} = 0.33 as compared to 0.31 in case of population I and III

Population III can undergo bottleneck effect because of smaller population size

The frequency of the brown allele will  least likely be altered in the population that has highest  brown individual , i.e population I

4 0
3 years ago
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