Which contributes more to an atom's mass: electrons or protons? Which contributes more to an atom's size?
A. Protons contribute more to both the mass and size of an atom.
B. Protons contribute more to an atom's mass, while electrons contribute more to its size.
C. Electrons contribute more to an atom's mass, while protons contribute more to its size.
D. Electrons contribute more to both the mass and size of an atom.
Answer: B
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A) producers; the abundance of primary consumers B) detritivores; the abundance of decomposers C) top consumers; the abundance of lower consumers and producers D) top consumers; one another E) flooding; terrestrial ecosystems
The major adaptions that made it possible for mammals to evolve into their modern forms included all of the following except ________
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Fossils of ancient polar plants are currently found near the equator because the ________
A) entire earth had polar conditions at the time the plants were living B) plants lived near the poles, but landmasses have drifted to current locations C) plants probably were tolerant of both tropical and polar conditions D) plants were distributed to current locations by ancient glacial ice sheets E) poles were at the equator at times in the geologic past