Tropical grasslands differ from middle-latitude grasslands in that:
a. the environmental control factor of fire is insignificant.
b. savanna grasses are very short.
c. the tropical grassland includes a scattering of trees.
d. all of these
C
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Most of the world's cities have huge ecological footprints and are not self-sustaining systems.
Answer the following statement true (T) or false (F)
One of the greatest success stories of the positive impact of chemistry research and environmental policies and regulations relates to
A) nitrogen oxides and the control of acid precipitation. B) CFCs and the destruction of the ozone. C) the reduction of ozone pollution over major cities in North America. D) the use of fossil fuels and the reversal of global climate changes.
Which organic compound is produced in the largest amount by the chemical industry?
A) acetylene B) benzene C) ethane D) ethylene
When a glacier is retreating, the upstream ice is still moving forward toward the downstream terminus of the glacier
Indicate whether the statement is true or false