Examples of mollusks that live on land are the
A. land crabs.
B. scorpions.
C. mussels.
D. snails and slugs.
E. earthworms.
Answer: D
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Why does an action potential travel in one direction down an axon?
A. because it needs to reach the synapse to trigger release of neurotransmitter B. because voltage-gated sodium channels cannot immediately reopen C. because voltage-gated potassium channels remain open longer D. because the diffusion of charge can only occur in one direction
Which of the following is random?
a. evolution b. natural selection c. genetic variation d. All of the other choices are correct.
What is the main reason that mammals underwent adaptive radiation after the demise of the dinosaurs?
A. The mammals had little competition so it was easier for them to evolve into the niches that were once occupied by the dinosaurs. B. They had an "inner need" to become better suited to their environment. C. They had to adapt in order to physically survive the ice age. D. No answer choice is correct.
Viruses cause most human cancers.
Answer the following statement true (T) or false (F)