________ are heterotrophic protists; ________ are photoautotrophic protists
A) Mixotrophs; protozoans
B) Protozoans; algae
C) Protozoans; plants
D) Parasites; protozoans
Answer: B
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In animals with a brain, the two major divisions of the nervous system are the
a. autonomic and peripheral systems. b. central and peripheral nervous systems. c. brain and spinal cord. d. nerves from the brain and the peripheral systems. e. cranial and spinal nerves.
The explanation for the differences between a
human liver cell and a cell from the skin is the a. maternal and paternal origins of the genes. b. gene content of the two cells. c. expression of the genes in the two cells. d. fact that they originated from different primary tissue layers. e. different functions of the cells.
Discuss how two of the following alter allele frequencies in populations: nonrandom mating, genetic
drift, gene flow, and natural selection What will be an ideal response?
In a population with low death rates, this age structure diagram indicates that
A. the biotic potential must be larger than usual. B. the population will continue to grow for some time. C. the population is stable. D. the population is decreasing.