In the above diagram, C represents which of
the following structures?
a. large diameter blood vessel
b. capillary beds
c. the zone of diffusion of gases and nutrients
d. the heart
e. large diameter blood vessel and the zone of
diffusion of gases and nutrients
D
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An embryo fish in its egg cannot survive outside the egg because it has underdeveloped tissues and organs needed for survival. The embryo has a large number of cells undergoing mitosis for the purpose of
A. fertilization of the gametes, so the embryo can continue growing and hatch. B. asexual reproduction, to produce larger numbers of embryos, so that some will survive. C. production of new cells that can differentiate and specialize for different functions. D. replication of new DNA copies, so that meiosis will further grow the embryo. E. sexual reproduction of gametes, to produce new offspring.
The male urethra is lined with ________ tissue.
a. connective b. squamous c. cuboidal simple d. columnar stratified e. muscle
CCK is a gut peptide thought to be a(n) _________ peptide,
Fill in the blank(s) with the appropriate word(s).
What is the pellicle?