Which organism has a nerve net that allows it to respond to a stimulus in a coordinated way?

clam

earthworm

hydra

shark

Classify the structures as homologous or analogous, depending on their structure and function.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Number and variety of living organism; includes genetic, species, and ecological types