In plants with ________, root hairs are less abundant because these fungal filaments take over their function for the plant.
A. mycorrhizae
B. branch roots
C. two pericycles
D. lichens
Answer: A
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Sexual reproduction:
A. results in offspring that are not genetically identical. B. results from combining genetic material from two gametes. C. results in a new generation that is not genetically identical to its parents. D. results in a new generation with the same number of chromosomes as the parents. E. All of these choices are correct.
A benefit of _____ diversity is a species’ future potential for adaptation.
a. chemical b. genetic c. ecosystem d. physical
In 2008, the United States generated about how many million tons of garbage?
a. 100 b. 200 c. 300 d. 400 e. 500
Darwin and Wallace were the first to propose _____
A) that evolution occurs B) a mechanism for how evolution occurs C) that Earth is older than a few thousand years D) natural selection as the mechanism of evolution