Human agriculture started about ______ years ago
a. 100
b. 1,000
c. 11,000
d. 110,000
e. 1,100,000
C
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An organism is found to be almost unchanged from its 200 million year old fossil. This is an example of ____
a. stasis b. coevolution c. mass extinction d. adaptive radiation e. idealized design
Air is continuously forced through tubes that thread
through vascularized tissue in a pair of inelastic lungs in a. some fish. b. amphibians. c. birds. d. reptiles. e. some small mammals.
In which of the following cells would you typically find a single chromosome in the form of a circular loop.
A. Plant cell B. Bacterial cell C. Animal cell D. both a and c
The skin is an effective barrier against invading microbes because
A) the outer layers of cells are dead. B) the surface is covered in salt. C) it is well supplied with blood vessels to flush microbes from the surface. D) no microbes are able to survive on the surface. E) the outer layers are dead and covered in salt.