What describes marsupial embryos?
A. They are born fully developed.
B. They are born highly underdeveloped.
C. They hatch from an internal egg.
D. They hatch from an externally laid egg.
E. They are nourished by the placenta.
B. They are born highly underdeveloped.
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Many protists and fungi share what characteristic?
a. They are heterotrophs. b. They are autotrophs. c. They are decomposers. d. They are prokaryotes.
A plant's response to an external stimulus involves receptors. A receptor that responds to light normally contains
A. an end product of a metabolic pathway. B. a pigment component. C. a transduction pathway. D. a series of relay proteins.
Which of the following plant hormones prevents plant tissues from senescing, or aging?
A. ethylene B. cytokinin C. gibberellin D. abscisic acid E. auxin
Which of the following is part of the middle ear?
A. semicircular canals B. pinna C. auditory canal D. malleus E. cochlea