Brachiopods, phoronids, and bryozoans all have a ring of ciliated tentacles around the mouth. These animals are thus
grouped as:
a. rotifers
b. flatworms
c. ctenophores
d. lophophorates
e. onychophorans
d
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What is the primary means of reproduction among the protists, cnidaria, and tunicates?
A. asexual reproduction B. sexual reproduction C. asynchronous reproduction D. hermaphroditic reproduction
During parturtition, mechanical pressure
caused by the movement of the fetus through the uterus causes the release of ___ from the ___.
a. HCG---hypothalamus b. oxytocin---posterior pituitary c. oxytocin---hypothalamus d. HCG---posterior pituitary e. oxytocin---adrenal cortex
A single contraction of all the muscle fibers in a motor unit is known as ____
a. a muscle twitch b. tetanus c. summation d. relaxation coupling e. isometric contraction
The work of Walter Sutton and Theodor Boveri suggested that the hereditary units, or genes, described by Mendel are located on ________
Fill in the blank(s) with correct word