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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Of the following, which lies closest to the surface of the Earth?
A) mesosphere B) mesopause C) stratopause D) thermopause E) stratosphere
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.