External fertilization is most common in animals living in ____
a. mountains
b. prairies
c. forests
d. oceans
e. deserts
ANSWER: d
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By definition, a nerve is
a. a bundle of sensory, motor, or both types of nerve fibers outside the central nervous system. b. a single extension of a neuron. c. the same as a neuron but within the central nervous system. d. a collection of nerve cell bodies outside the central nervous system. e. a fiber more than ten inches in length.
Which of the following is an enzyme?
a. fibrinogen b. fibrin c. plateletase d. thrombin e. plasminogen
Four of the five features listed below are
characteristics of the tropical rain forest. Select the exception. a. extensive erosion b. great biotic diversity c. high rate of decomposition d. lack of soil nutrients e. large herds of herbivores
Peptide hormones such as insulin cannot pass through the plasma membrane so they bind to receptors on the target cell's surface, triggering the production of second messengers
Indicate whether the statement is true or false