Darwin calculated that if reproduction was not limited, a single pair of elephants could leave ____
descendants after 750 years.
a. 750
b. 15,000
c. 150,000
d. 19 million
e. 190 million
D
Biology & Microbiology
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Ocean pollution includes all except
a. toxins. b. heavy metals. c. dissolved oxygen. d. oil. e. PCBs.
Biology & Microbiology
What protects many types of seaweed from desiccation?
a. Cuticle b. Stipe c. Mucilage d. Thallus
Biology & Microbiology
The secretion of which hormone decreases when calcium blood levels increase?
a. calcitonin b. parathyroid hormone c. thyroid hormone d. epinephrine e. norepinephrine
Biology & Microbiology
Cell membranes of living systems are commonly made of a____________________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology