Vascular plants having flowers and seeds are called ____
a. ostracoderms
b. spores
c. angiosperms
d. gymnosperms
e. therapsids
c
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Which led to the dramatic expansion of iron reserves in Minnesota in the 1960s?
A. A new process was developed to mine taconite. B. The price of iron went up dramatically. C. They started recycling tin cans. D. They found a substitute for steel.
What happens when the waters of a coral reef exceednormal temperatures for too long?
a. Coral polyps overheat and die.
b. Corals eject their zooxanthellae. c. Corals break down their shells. d. Corals increase their zooxanthellae. e. Corals poison their zooxanthellae.
In a systems model, movement of energy or matter into the system is a(n):
a. subsystem. b. output. c. input. d. closed system.
Which of the following scenarios can lead to the formation of a kame?
A) Sediment accumulates in a hole in the ice. B) Sediment is carried on top of the glacier. C) Sediment collects in subglacial stream channels. D) Sediment covers a stagnant block of ice.