Which of the following would NOT likely develop as an emerging virus?
A) a virus harmful to humans that changes very slowly over time
B) A virus that is normally harmless to humans undergoes rapid mutations.
C) a virus that begins to infect people in New York City, a popular tourist destination
D) a virus that affects primarily rabbits mutates and infects humans
A
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In general, sympatric speciation requires the action of _____ selection acting against hybrids
A. disruptive B. stabilizing C. directional D. artificial E. ecological
An excitatory postsynaptic potential ____
a. is cancelled out by an inhibitory postsynaptic potential b. has a hyperpolarizing effect c. will drive the membrane away from its potential d. is summed with an inhibitory postsynaptic potential at the input zone of a neuron e. works so that only one impulse can be received at a time
What does a gametophyte produce?
A) Haploid gametes B) Diploid gametes C) Haploid spores D) Diploid spores
A sudden increase in diversity of many animal phyla was seen in the ____ period
a. cambrian b. permian c. devonian d. ediacaran e. cretaceous