Most organic matter found in soils results from primary producers such as ________.
A. photosynthetic protists
B. vascular plants
C. cyanobacteria
D. None of the choices are correct.
Answer: B
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What functions as the supportive component of the skeleton in an animal with a hydrostatic skeleton?
A. a fluid-filled body cavity B. the circular muscles C. the longitudinal muscles D. the circular and longitudinal muscles E. the body wall
Which groups of plants have at least some members that possess tissues capable of transporting water and nutrients?
_____ spermatophytes. _____ lycophytes. _____ bryophytes. _____ tracheophytes. _____ embryophytes.
If a toxin blocks the receptors for the neurotransmitter on the postsynaptic muscle cell,
____________________.
a. paralysis will occur b. the person will have a seizure c. the action potential in the presynaptic cell fails d. calcium, which can function as a neurotransmitter, will be released
Moistening and lubrication of food occurs in the
human a. mouth. b. esophagus. c. stomach. d. duodenum. e. jejunum.