Which of the following is not an environmental control that may help determine the species which occupy an ecosystem?
a. the age of the ecosystem
b. the intensity of sunlight
c. the texture and chemistry of the soil
d. other plants and animals
A
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A helpful, but somewhat more expensive way of controlling unwanted vegetation such as invasive plants is short-term trampling by large numbers of livestock
Indicate whether the statement is true or false
A(n) ____________________ effect is an immediate or rapid reaction to exposure to a harmful substance
Fill in the blanks with correct word
One of the sources of dangerous heavy metal emissions is from incinerating
A. Bleached paper containing chlorine B. Aluminum foil C. Batteries D. Residue from household cleaning products E. Plastics
The trees that died in the Pacific Northwest after the great earthquake of 1700 were killed by ________.
A. seawater after faulting dropped the land below sea level B. a cloud of methane that was released from sediments during the shaking C. seawater after a tsunami rushed onshore D. the liquefaction of their underlying soils E. mass wasting events in the days after the earthquake