Which of the following is NOT true of the
human embryonic heart?
a. before developing four chambers, it
resembled a fish heart
b. before developing four chambers, it had
three chambers like an amphibian
c. it begins beating around the third week
d. all of these (a through c) are NOT true of
the human embryonic heart
e. all of these (a through c) are true of the
human embryonic heart
E
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Indicate whether the statement is true or false.
What best describes the tunic of a tunicate?
A. It is made of chitin, like the shell of a crab. B. It is made of calcium carbonate, like the shell of a clam. C. It is made of keratin, like human hair. D. It is made of cellulose, like the cell wall of a plant.
In a fifty-two card deck, the chances of drawing the only ace of spades are
A. 1/4. B. 1/52. C. 1/13. D. 1/26.
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