Niches apply to:
a. individual organisms.
b. individual species.
c. groups of species.
d. communities.
e. ecosystems.
b
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The benefit provided by all hearts with two atria is
A. not all the blood has to pass through both sides of the heart. B. there is an extra place to store blood when the animal is at rest. C. that there are two muscular regions for pumping blood out of the heart to different organs. D. that blood is pumped into body tissues at high pressure. E. complete separation of oxygenated and deoxygenated blood.
Mitosis and cytoplasmic division of a cell in an ovule produces four __________, one of which gives
rise to the female gametophyte. Fill in the blank(s) with the appropriate word(s).
What is the average cardiac output from each ventricle in one minute?
a. 3 liters b. 4 liters c. 5 liters d. 6 liters e. 7 liters
Invertebrates that feed on coarse particulate organic matter (CPOM), such as leaves that fall into streams and rivers, are referred to as
A) shredders. B) gougers. C) grazers. D) collectors.