Which of the following describes when a species that is not divided by any geographic barrier evolves into separate species within the same location?
a. gene flow
b. founder effect
c. sympatric speciation
d. allopatric speciation
c. sympatric speciation
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Which of the following produce organic acids that may contribute to weathering of rocks?
A. arctic plants B. water plants C. aerial plants D. lichens E. mosses
An agriculturalist is very concerned because his wheat crop is suddenly covered with red streaks. When consulted, you identify the issue as a condition known as rust. What would you advise the agriculturalist is the best preventive strategy for addressing the cellular basis of the rust?
A. Rust is caused by fungi that give a reddish cast to soils in which they grow, which is taken up by the plant. Treat the soil to prevent the uptake of the rust-causing fungi. B. Rust is caused by fungi that have reddish spores that emerge from the leaves of infected plants. Treat the plant to eliminate the fungi that causes the rust. C. Rust is caused by fungi that have enzymes for breaking down plant structure. Treat the plant to make it resistant to the enzymes that are causing the rust. D. Rust is caused by rust-colored mushrooms produced as fruiting bodies. Treat the plant to eliminate the fruiting bodies that are recognized as rust.
Why are correlations less convincing than controlled experimental results?
A) Correlations are subject to greater bias than experimental results. B) Correlations cannot be observed outside the laboratory. C) Correlations cannot be statistically significant. D) Correlations do not eliminate as many alternative hypotheses.
Head lice are a common pest. How long can they live away from a human host?
a. Only a short time b. Several days c. Several weeks d. Up to one year if they are warm