The fossil record is incomplete because
a. Not all fossils have been found.
b. Some fossils have decomposed.
c. Some life forms left no fossils.
d. Some life forms have left no fossils and some have decomposed
e. Not all fossils have been found, some have decomposted and some life forms have left no fossils.
E
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Since 1976, the EPA has used the Toxic Substances Control Act to ban only 5 of the roughly 85,000 chemicals in use.
Answer the following statement true (T) or false (F)
Cool clouds:
A) contain no water droplets above 0 degrees Celsius. B) contain substantial numbers of ice crystals at all elevations within the clouds. C) have regions with above-freezing temperatures. D) typically form precipitation through the collision-coalescence process.
What is one of the three principles of sustainability provided by economics, politics, and ethics?
A. a dependence on solar energy B. a focus on chemical cycling C. the degradation of natural capital D. a responsibility to future generations E. the ability to retain biodiversity
Which nation-state(s) produce the most diamonds in Sub-Saharan Africa?
A) Nigeria B) South Africa C) Botswana D) Namibia E) South Africa, Botswana, and Namibia