Diversity of plant species in a plot increases overall yields
What will be an ideal response?
As was noted in the text, diversity increases the overall health of the plot, including
the plant output, but the plant matter is not always human food. Monoculture makes the
excess readily available to the observer and the crop is desirable from a human standpoint.
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The magnetic fields of a pair of nearby magnets can
A) only add. B) cannot add or subtract. C) add or subtract by vector rules.
Stefan's Law says:
A) the hotter a star's surface, the bluer it looks to us. B) E = mc2. C) the energy radiated by a blackbody is proportional to T3. D) that if the Sun's temperature were doubled, it would give off 16X more energy. E) that doubling the star's temperature would also double its peak wavelength.
Imagine that we have a liquid with a density of 3.5 g/cm3. Knowing that objects of higher density will sink in the liquid, will a piece of quartz sink or float in the liquid?
What will be an ideal response?
Heavy nuclei are unstable because
a. each nucleon is a separate particle that is not acted on by the nuclear force. b. there are not enough protons present relative to the number of neutrons for the electrical force to be strong enough. c. the nuclear force dominates the Coulomb repulsive force at distances less than 2 fm, but falls off rapidly at greater distances. d. nuclei are stable only when the number of neutrons equals the number of protons. e. nuclei are stable only when the number of protons exceeds the number of neutrons.