The major source(s) of chlorofluorocarbons (CFCs) in the atmosphere was/were ________
A) combustion of fossil fuels
B) burning of fossil fuels and coal
C) microbial fermentation of organic matter in coal mines, oil wells, and livestock
D) refrigerants, solvents, and spray propellants
E) emissions from automobile exhaust and chemical fertilizers
Answer: D
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Even if global consumption could be held constant at 2016 levels, for most metals, present reserves are projected to last only a few decades.
Answer the following statement true (T) or false (F)
The Cambrian explosion refers to ____
a. a meteorite impact b. a sudden appearance of fossils c. a sudden extinction d. the start of evolution e. volcanism that created the Ring of Fire
Processes such as changes in orbital geometry or volcanic eruptions have clearly affected climate in the past, and these explain the dramatic warming of the last 200 years
Indicate whether the statement is true or false.
The largest marine animals, such as the baleen whales, eat: a. secondary consumers, such as krill
b. small fish. c. primary consumers, such as copepods. d. top consumers, such as seals and large fish.