An animal has a heart with two chambers and
blood flows in a single circuit. This animal is
a. a salmon.
b. a frog.
c. a red-winged blackbird.
d. a crocodile.
e. more than one of these
A
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The reservoir of Treponema pallidum is the
A. guinea pig. B. fox. C. bat. D. human.
Birth control injection (e.g. Depo-Provera) is __________.
[A] effective for 3 months [B] obtained without a prescription [C] given in the arm [D] a way of preventing STDs
Most of the energy within an ecosystem is lost:
a. when organisms disperse b. when organisms die c. as a result of metabolism d. by organisms at the top of the food web e. by decomposers
Root structures that grow around and encapsulate mutualistic nitrogen-fixing bacteria are called ____.
A. hyphae B. mycorrhizae C. Casparian strip D. root hairs E. root nodules