El Niño/Southern Oscillation refers to changes in weather patterns in the:
a. Pacific Ocean.
b. Atlantic Ocean.
c. Indian Ocean.
d. Southern Ocean.
e. Antarctic Ocean.
A
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The simplest nervous system found in nature is the nerve net. An example of an organism that senses and responds to its environment with this ancient system would be
A. a jellyfish. B. a cockroach. C. an earthworm. D. a frog. E. a fiddler crab.
Icefish have which type of circulatory system?
A. closed with a two-chambered heart B. opened without a heart C. closed with a single-chambered heart D. closed with a three-chambered heart E. closed with a four-chambered heart
The production of a single type of spore that gives rise to both sperm and eggs is known as _______.
A. Homospory B. Heterospory C. Monophyly D. Embryogenesis E. Symbiosis
Which type of bond represents a weak chemical bond?
a) nonpolar covalent bond b) polar covalent bond c) hydrogen bond d) ionic bond