The age that saw a great diversification of land plants, as well as the first amphibians, was the
a. Cambrian.
b. Cretaceous.
c. Devonian.
d. Jurassic.
e. Ordovician.
C
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What specialized cells receive and respond to stimuli?
Four of the following statements about crocodilians are true. Which statement is false?
a. They live in or near water. b. They are predators with sharp teeth. c. They have a two-chambered heart. d. They have powerful jaws. e. They are the closest living relatives to birds.
The ratio of net productivity at one trophic level to net productivity at the trophic level below it is known as:
1.Ecological efficiency 2.Harvesting efficiency 3.Assimilation efficiency 4.Production efficiency
A flap of tissue called the __________ directs air through the __________, the opening to the
__________ (windpipe). Fill in the blank(s) with the appropriate word(s).