In the absence of geographic barriers, ________ speciation may occur when reproductive isolating mechanisms develop between two populations

A) allopatric B) extrinsic C) sympatric D) ecological


Answer: C

Biology & Microbiology

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What is the single unique characteristic that distinguishes extant birds from other extant vertebrates?

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Of the following mammals, you would expect the _____ to have hemoglobin with the lowest affinity for oxygen.

A. mouse B. wolf C. human D. horse E. elephant

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It is important for cattle to add proteins to their body, so which plant would be best for them to eat?

A) alfalfa B) oats C) corn D) barley

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When a neurotransmitter released from one neuron binds to a ________ on a second neuron, that neuron depolarizes and fires.

A. enzyme-linked receptor B. ligand-gated ion channel C. voltage-gated ion channel D. nuclear receptor E. G-protein coupled receptor

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