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Ipatiy [6.2K]
4 years ago
9

Is the following statement true or false? “Malaria caused the sickle cell allele to appear.” Justify your answer in one or two s

entences.
Biology
1 answer:
Greeley [361]4 years ago
5 0

This statement is true.

As the sickle cell allele was a mutation in the cell, but it helped prevented Malaria in the countries close to the equator. As this mutation helped many resist against Malaria and nature did not let this mutation die out because it still helps many people.

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with a population growth rate of 5% how long will it take for a population to double from 20,000 to 40,000 people?
Alik [6]

Answer:

15 years

Explanation:

Compound growth

Equation:

20000 x 1.05 to the power of how ever many years needed

20000 x 1.05 to the power of 15 takes it just over, with 41578 people alongside decimals.

Therefore, it is 15 years.

7 0
2 years ago
Read 2 more answers
Predict how a fish's behavior would change if it had an open circulatory system instead of a closed circulatory system
o-na [289]

Since the blood does not return to the heart after flowing through the gills, pressure is not regenerated within the system before it flows to the systemic circulation (the rest of the body). A single circulation would experience a loss of pressure after flowing through the gas change organs (gills of a fish) due to the high cross-sectional area presented by the capillaries of the gills. For ectotherms like fish, this is efficient enough to support their activity level. A fishes behavior would change in a few ways if it had an open circulatory system. However, the most common would be the fish would become extremely active.

7 0
3 years ago
What do structures B and C have in common?
pav-90 [236]

The structures B and C have in common is that both contain partially disgested food. Thus, the correct option is B.

<h3>What are structures B and C here represent?</h3>

Structure B represents the food pipe or esophagus, while structure C represents the stomach.

Chyme is produced only when food is fixed with gastric juice which is only present in the stomach, hence option A is incorrect.

Waste material is found in the rectum of the body structure, not in the esophagus and the stomach. Thus, option C is also incorrect.

Therefore, the correct option is B.

To learn more about the digestive system, refer to the link:

brainly.com/question/17813397

#SPJ1

6 0
2 years ago
What is the primary function of this body system?
mr Goodwill [35]
Organ system if that’s wrong then sorry but let me know ?
5 0
3 years ago
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The diagram shows the growth of a plant over several months
kotykmax [81]

Answer: Hormones in the plant help fruits develop and ripen

Explanation:

5 0
3 years ago
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