Converting a prairie to a farm field is an example of ________.
a) overharvesting
b) habitat loss
c) exotic species
d) climate change
Ans: b) habitat loss
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Mitochondrial disorders can be caused by mutations in all the following except:
A. cytoplasmic DNA B. mitochondrial DNA C. nuclear DNA
During the Silurian, the oxygen gas concentration in the atmosphere is postulated to have reached an amount equivalent to more than 10 percent of its present-day concentration. Thus, nearly all lethal ultraviolet radiation was unable to reach the Earth's
surface, making dry land available for newly evolved forms. Which of the following major events in the evolution of animals and plants probably occurred at this time? A) The amphibians developed watertight skins and eggs. B) Primitive bryophytes and fern-like plants appeared. C) The first major groups of seed plants appeared. D) The crayfish become the first land organisms.
Cells in which two domains lack a membrane-bound nucleus?
A. Eukarya B. Archaea C. Eubacteria
what is the key cell in the field of cancer immunotherapy?
What will be an ideal response?