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Birds differ from more primitive vertebrates by

The vertebrate fish group that is thought to be ancestral to the tetrapods is __________________.

Which of the following statements most accurately describes the protostomes?

This is the only Homo species alive today.

Black bread molds produce diploid reproductive structures called

A grasshopper has an elaborately branching system of tubes within its body that it uses for gas exchange. These tubes are called

The body plan of which animal lineage is characterized by no circulatory system, a highly branched, sac-like gut with one opening, and a thin flat body with all cells fairly close to the gut?

A zygosporangium is produced by

Molds easily contaminate foods because fungi

A marsupial is a(n)