Which of the following observations best supports the conclusion that dolphins and sharks do not have a recent common ancestor?
a. dolphins form social groups, but sharks are solitary.
b. dolphins hunt during the day, but sharks are nocturnal.
c. the number of dolphin species is far less than the number of shark species.
d. the jawbone structure in dolphins is very different from the jawbone structure in sharks.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a