Answer:
a thing or event that evokes a specific functional reaction in an organ or tissue.
Explanation:
The best way to prevent cholera is to promote healthy sanitation practices and to filter and treat drinking water sources. Cholera bacterium is usually found in water or food sources that have been contaminated by feces from infected person with cholera. It is mostly found and spread in places with inadequate water treatment, poor sanitation, and inadequate hygiene.
Both genes need to be recessive in order for a recessive trait to be expressed.
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