Compared to energy-flow in ecosystems, the flow of matter ________
A) reflects conservation and recycling
B) is one-way
C) is always dissipated as heat
D) does not involve either detritivores or detritus
E) moves from consumers to producers
A
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A(n) ________ is not a fundamental particle found in atoms.
A) electron B) selectron C) proton D) neutron4
How long does it take most deep water to rise to the surface?
a. 100 to 200 years b. 200 to 300 years c. 500 to 600 years d. 1,500 to 1,600 years
The fact that the Earth's orbit around the sun changes over time is called ____________________. Fill in the blank(s) with the appropriate word(s)
Which step would be most likely to have the greatest effect on improving outdoor air pollution?
A) drastic reduction in the use of aerosol cans B) drastic reduction in cigarette smoking C) drastic reduction in radon emissions D) significant reduction in automobile use E) drastic reduction in burning firewood