Which of these groups includes the most species?
a. protostomes
b. roundworms
c. arthropods
d. mollusks
C
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Using sequence data, it has been shown that:
A. humans evolved from the Neanderthals. B. Homo sapiens arose gradually in many places. C. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Africa. D. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Asia. E. Homo sapiens evolved from Homo erectus.
The normal _____________________ protein binds to hundreds of other proteins to facilitate synaptic function, cell signaling, intracellular transport, and transcription
Fill in the blank(s) with correct word
A community of organisms interacting with their physical environment is a(n) ______.
A. population B. organism C. biosphere D. ecosystem E. macromolecular community
All vertebrates have _____
a. an open circulatory system c. lungs b. a two-chambered heart d. none of these