Which example illustrates darwin's main contribution to the theory of evolution? an agricultural pest has been exposed to a pesticide that wipes out the entire species. in a laboratory, a scientist chooses the most intelligent mice and breeds them to advance the species. when exposed to antibiotics, most bacteria in a population die but some survive and live to reproduce. in the african savannah, a scientist observes that a wildebeest calf has inherited its coat pattern from its father.

The correct answer is when exposed to antibiotics, most bacteria in a population die but some survive and live to reproduce.

Explanation:

A bacterial population getting exposed to antibiotics because of which the majority of them dying, and only a few surviving and living to reproduce is an illustration of Darwin's theory of evolution.  

According to the theory, all the species of organisms originate and develop via the natural selection of small, inherited changes, which enhances the tendency of the species to survive, compete, and reproduce.  

it would be c. xylem.

c. establishing proper sleep hygiene