Tetrapods are the direct descendants of
a. lobe-finned fish.
b. ray-finned fish.
c. cartilaginous jawed fish.
d. cartilaginous jawless fish.
e. lancelets.
A
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An egg rolling out of its nest is a(n) _______ to a nesting goose.
A. conditioned response B. reproductive habituation C. sign stimulus D. gene expression E. operant conditioning
All of the following are critical factors for DNA replication on the leading strand except?
A. primer. B. DNA ligase. C. DNA polymerase. D. DNA primase. E. deoxynucleoside triphosphates.
While some of the daughter helper T cells are secreting the appropriate interleukins, others form into ________ cells.
A) memory T B) suppressor T C) memory B D) plasma E) cytotoxic T
"Ecology" is best defined as:
a. the study of the relationships between all living organisms and their environments. b. the study of interactions between predator and prey populations. c. the study of aquatic organisms.