Which is a correct pairing of a biome and its characteristics?
A) temperate broadleaf forest—mild winters; scarce rainfall; predominantly dicot vegetation
B) chaparral—mild, rainy winters; long, hot, but wet summers
C) savanna—long, cold winters; vegetation dominated by conifers
D) tundra—very cold winters; only the upper layer of the soil thaws during summer
Answer: D
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Which of the following is true of chemical synapses? Select all correct choices
A. They are more common than electrical synapses. B. Their vesicles fuse with the presynaptic membrane to release neurotransmitters. C. Once released, their neurotransmitter molecules may return to the presynaptic cell.
The spindle apparatus becomes visible during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
What explains why two genes have a high percentage of ending up in the same gamete?
a. heterozygous b. allele variation c. co-dominance d. independent assortment e. linkage
In areas that have a stable population, the number of children born in a period of time is
A) decreasing. B) lower than the number of adults. C) higher than the number of adults. D) increasing. E) approximately equal to the number of adults.