If the Sun collapsed to a black hole, the time required for the Earth to orbit the collapsed Sun would
A) increase.
B) decrease.
C) stay the same.
C
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Calculate the percent increase in CO2 between 1960 (at 320 ppm) and 2010 (at 400 ppm). The best answer is
A) 20%.
B) 25%.
C) 80%.
D) 400%.
Which of the following describes the air conditions around a cold-type occluded front?
A. cold surface air behind it B. warm surface air behind it C. cold air rising above warmer air D. cold surface air ahead of it
Which of the following is the reason for the lower levels of water in the Lake Mead reservoir since 2000?
A) Over harvesting in Nevada B) Deforestation C) Drought D) Too much government regulation E) Illegal diversion to Mexico
The development of ________, organisms that reproduce sexually and have cells that contain nuclei, may have increased dramatically the rate of evolutionary change
Fill in the blank(s) with correct word