The region of the brain with the highest
concentration of neurons is the
a. hypothalamus.
b. cerebrum.
c. cerebellum.
d. pons.
e. medulla oblongata
C
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Gymnosperms are the most ecologically diverse plants on Earth
a. True b. False
The ____ of marine mammals receives normal blood supply during deep dives
a. lungs b. heart c. brain d. blood vessels e. heart, brain, and blood vessels
Conservation biologists conduct a population viability analysis to determine ____
a. whether an environment is too badly degraded to support a species b. how large a population must be to ensure its long-term survival c. likely source populations d. likely sink populations e. the annual reproduction rate of a population
Spiders use which of the following mouthparts for
subduing prey? a. mandibles b. pedipalps c. chelicerae d. maxillae e. labial palps