Circulation is vital because it
A. delivers wastes to tissues.
B. delivers carbon dioxide to tissues and removes excess oxygen.
C. inflates the lungs.
D. supplies oxygen and nutrients to and removes wastes from tissues.
Answer: D
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The posterior pituitary secretes ____________________ and ____________________
Fill in the blank(s) with correct word
The smallest unit that retains the chemical properties of a particular type of matter is a(n) ________.
A. atom B. molecule C. element D. ion
Cleavage occurs during
A. the pre-embryonic period. B. the embryonic period. C. fertilization. D. the fetal period. E. organogenesis.
In the retina, the ________ cells are the second-order neurons of the visual pathway whose axons form the optic nerve.
Fill in the blank(s) with the appropriate word(s).