The distribution of blood to various tissue areas is controlled mainly by the constriction and dilation of

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.

Regarding most of the narrator’s story, which word best describes the tone?

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