Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error).
Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.
Genetic drift can have major effects when a population is sharply reduced in size by a natural disaster (bottleneck effect) or when a small group splits off from the main population to found a colony (founder effect).
Every seventh time a rat presses a lever, it receives food pallets.
Answer:
B. antiretroviral therapy
Explanation:
these are drugs that are degined to improve the immune system of the patient to enable resistance to other pathogens
Cholera is caused by drinking contaminated water. Government should respond in many ways like new rules for clean water act, wastewater disposal rules, increase current fines and federal fines.
<h3>What is the reason for spread of cholera?</h3>
Cholera is caused by a bacterium namely Vibrio cholerae. It is caused by drinking contaminated water. Characterized by diarrhea and dehydration.
Cholera can be prevented by using following ways:
- A single dose live oral cholera vaccine has been approved by FDA.
- Lawmakers should propose new rules under the established clean water act.
- States should use certain wastewater disposal rules.
- Federal agencies should increase current fines for noncompliance of public water.
- Agencies should collaborate to construct initiatives to globally promote clean water use.
Thus, the correct options are A, B, C and D.
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