Briefly explain how natural selection has worked, and is working, to change populations over time.
What will be an ideal response?
Natural selection works by selecting the population best suited genetically for the current environmental conditions to survive and reproduce. Populations less suited will not provide as many offspring, and over time, will be reduced in size or become extinct.
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A community of different organisms interacting with one another and with their nonliving environment of soil, water, and other forms of matter is called
A. a species. B. an ecosystem. C. a population. D. a lithosphere. E. a community.
Which of the following is NOT a problem associated with pesticides?
A. bioaccumulation B. resistance to the pesticide C. They primarily affect target organisms. D. persistence in the environment
What is the approximate base fl ow, in m?/sec, at the Santa Cruz River
station? What will be an ideal response?
If a chemical is not very abundant in the ocean but has a high rate of delivery to the ocean from land sources, it will have a ________ residence time in the ocean and will ________ become part of the seafloor sediments.
A. short; quickly B. variable; variably C. long; quickly D. long; slowly E. short; slowly