What biome borders on boreal forest?
a. savanna c. tundra
b. taiga d. chaparral
C
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The earliest land plants appeared in the fossil record:
A. about 500 million years ago B. about 300 million years ago C. about 100 million years ago D. a billion years ago E. about 10 million years ago
Which structure(s) grow(s) just in front of animal tissues where only the Hoxc6 geneis expressed?
a. forelimbs and hindlimbs b. hindlimbs only c. ribs only d. forelimbs only e. forelimbs and ribs
What is the major assumption of the exponential model of population growth?
a. resources are unlimited b. organisms selectively choose their mates c. the death rate equals the birth rate d. biotic potential is limited e. density-dependent factors are at work
Which of the following can be used to accurately describe viruses?
a. They are small, cellular infectious agents that are only capable of reproducing when inside a living cell, and they can attack plants as well as animals. b. Each is typically a piece of genetic material encased in proteins, and they can reproduce on their own. c. They can attack plants, animals, and protozoans, and each is typically a piece of self-replicating genetic material encased in proteins. d. Typically just a piece of genetic material encased in proteins, viruses are small, non-cellular infectious agents that are only capable of reproducing when inside a living cell such as those of plants, animals, fungi, protozoans, or bacteria.