Which component of the earth's atmosphere is decreased due to photosynthesis?
A) ozone
B) oxygen
C) hydrogen peroxide
D) carbon dioxide
Answer: D) carbon dioxide
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What method is often used by cells to move large solid material into the cell?
a. facilitated diffusion b. exocytosis c. simple diffusion d. active transport e. phagocytosis
If a cell is permeable to a solute, that solute will diffuse either into or out of the cell depending on the direction of its concentration gradient
a. True b. False
In sanitary landfills, the primary safeguard against groundwater contamination is to:
a. do nothing as groundwater contamination is not a problem with landfills. b. line the landfill with impermeable clay and plastic. c. design the landfill to use the natural slope of the land so water runs downhill without being contaminated. d. locate landfills on industrial sites where groundwater is not used for drinking.
Floods and earthquakes that affect population size are ____
a. carrying capacities b. replacement factors c. density-dependent controls d. density-limiting controls e. density-independent controls