All of the following factors influence the development of song in male white-crowned sparrowsexcept:a
acoustical stimuli.
b. genetics.
c. visual stimuli.
d. social interactions.
e. innate behaviors
C
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An excitatory postsynaptic potential
a. is only one of several types of graded 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 in a process known as synaptic integration. e. is none of these.
The mesophyll layer of leaves is important to plants because
A. it keeps the plant from drying out. B. it anchors the plant to the soil. C. most of the photosynthesis occurs here. D. most of the water needed for photosynthesis is absorbed here.
When DNA from two sources is combined into one single piece of DNA, it is known as
A) cloned DNA. B) recombinant DNA. C) a vector. D) a plasmid.
The first bilateral animal emerged during the Ordovician Period. Fossils of this organism were discovered in South Africa.
Answer the following statement true (T) or false (F)