An ecosystem is a(n) ________ system in terms of energy, and a(n) ________ system in terms of matter
A) open; open
B) closed; closed
C) closed; open
D) open; closed
E) open; partially closed (though a small amount of matter does get in and out)
A
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The mass number of an element is
A. the sum of the isotopes. B. the sum of the electrons and the neutrons. C. the sum of the protons and the neutrons. D. the number of protons. E. the sum of the electrons and the protons.
Any member of the primate suborder Anthropoidea, which includes New World and Old World
monkeys, apes, and humans:a. hominoid d. australopithecine b. hominid e. Neanderthal c. anthropoid
How are oil and gas extracted in the hydraulic fracturing process?
A)Injection of high-pressure fracking fluids increases the permeability of the rock and allows oil and gas to move into the well. B)Injection of high-pressure fracking fluids forces low-pressure oil and gas to the surface. C)Horizontal wells are drilled, and the oil and gas is pumped out. D)Injection of low-pressure fracking fluids enlarges pore spaces allowing the oil and gas to be pumped out. E)Injections of fracking fluid are used to generate small earthquakes, which shake oil and gas to the surface.
Factors that control populations that come from outside the population are known as
A. intrinsic limiting factors. B. environmental resistance. C. density dependant limiting factors. D. extrinsic limiting factors.