A significant change in land-plant communities occurred with the evolution of angiosperms in the Cretaceous
a. True
b. False
True
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Human carrying capacity made its initial increase in Europe during the Mesolithic time period because of ________.
A. decreased population due to disease B. more gathering of wild fruits and berries C. more emphasis upon food cultivation D. increased hunting of wild animals
A severe reduction in wetlands in the San Joaquin Valley of California played a significant role in the
severity of the 1977 duststorm. What caused the reduction of wetlands? What will be an ideal response?
An inversion:
A) implies that a layer of air is unstable. B) means that a layer of air is overturning. C) indicates that a layer of air is stable. D) has no significance as far as a meteorologist is concerned.
Of the following, which lies closest to the surface of the Earth?
A) mesosphere B) mesopause C) stratopause D) thermopause E) stratosphere