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Let’s say you could see all naked eye planets visible at the same time.  How splendid indeed!  Which planet would be closest to your horizon?

Within the mollusks, only the cephalopods have a

Which arthropod transmits a disease that causes about a million human deaths per year?

Ecdysozoans _______________

The specialized feeding structures found in horseshoe crabs and arachnids are called

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