Which statement is an example of commensalism? a. egrets eat insects that are unearthed after livestock graze, but do not affect the livestock. b. wasps lay eggs inside hornworms so that after hatching, the wasp larvae can feed on the hornworm. c. lions and hyenas both live in a savanna ecosystem and eat the same prey, antelopes. d. otters contribute to a high level of diversity in their ecosystem because they eat urchins, allowing kelp to grow. e. ladybugs consume insects such as aphids, mealyworms, and spider mites.

the correct answer is c lions and hyenas both live in the savanna ecosystem and they both eat the same prey. Reason being that they both eat the  same prey that some times they fight over the same food source    

Ans. Option (A).

Commensalism can be defined as a biological interaction, in which members of one species get benefits while members of other species neither get harmed or benefit.

Cattle egrets eat insects from grazing cows and feed on bugs and flies found in cattle. By this way, egrets get their food, but cattle do not get benefit or harmed. Hence, egrets and cattle represent commensalism.

Thus, the correct answer is option (A).

Stanislao Cannizaro.

Explanation:

Stanislao Cannizzaro (1826-1910) was a prominent European scientist of Italian origin whose studies in medicine, physiology and chemistry earned him great recognition throughout his professional life.

His main contributions to science are the reaction of Cannizzaro, the explanation of Avogadro's hypothesis, the essay Sunto di un corso di philosophia chimica and having established in a forceful way the difference between atoms and molecules.