Climate is the ____
a. average weather conditions an area receives over a short interval
b. average weather conditions an area receives over a long interval
c. annual amount of sunlight an area receives
d. annual amount of rainfall an area receives
e. annual amount of total precipitation that occurs in an area
ANSWER: b
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A healthy diet should include a variety of _____, which are plant-derived substances that may reduce the risk of disorders such as macular degeneration and heart disease
a. phytochemicals b. vitamins c. minerals d. all of the choices
The organismal concept of communities argues that species distributions along environmental gradients form clusters because they are interdependent
Indicate whether the statement is true or false
The lumen of capillaries is so small that red blood cells must travel through these blood vessels in single file or sometimes actually squeeze through
Indicate whether the statement is true or false
In the countercurrent exchange system of fish gills,
A) blood and water flow in the same direction. B) blood and water flow in opposite directions. C) blood and water are separated by a thick polysaccharide barrier. D) blood flow in the gills reverses direction with every heartbeat.