In tropical rainforests, vegetation layers are structured according to
a. how deep the rainfall penetrates into the forest
b. the plant's needs for sunlight
c. how well each plant handles predation by herbivores
d. nutrient availability and uptake by plant roots
e. tropical rainforests are not layered
B
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What is the approximate mass of a carbon atom in atomic mass units (amu)? How about a carbon dioxide molecule?
A. A carbon atom has a mass of about 12 amu. Carbon dioxide would then have a mass of 44 amu. B. A carbon atom has a mass of about 12 amu. Carbon dioxide would then have a mass of 28 amu. C. A carbon atom has a mass of about 6 amu. Carbon dioxide would then have a mass of 22 amu. D. A carbon atom has a mass of about 6 amu. Carbon dioxide would then have a mass of 32 amu.
We would expect populations in undisturbed natural communities with high biodiversity
A) to be near their carrying capacity. B) to have exceeded their biotic potential. C) to have grown beyond all types of environmental resistance. D) to be characterized by high emigration and low recruitment.
Air pollution is best defined as ________
A) suspended particles of gases that contain small amounts of solids and liquids B) gases or particles present in high enough concentrations in the atmosphere to harm humans, other organisms and structures C) any gases in Earth's atmosphere in trace amounts D) small particles in the atmosphere arising from volatile organic compounds E) organic chemicals that can vaporize into the air
The rate of global sea-level rise may be accelerated through greenhouse-effect heating.
Answer the following statement true (T) or false (F)