A permeable underground layer of rock, sand, and gravel saturated with groundwater is called a(n) ________.
A. aquifer
B. natural spring
C. submergence
D. hot spring
Answer: A
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Water enters the water vascular system of a sea star through a structure called the ____
a. ampulla b. ossicle c. radial canal d. ring canal e. madreporite
The graph above shows the survival of sociable weavers as a function of body mass. Sociable weaver body mass
seems to be an example of ____. a. directional selection
b. stabilizing selection c. sexual selection d. disruptive selection e. artificial selection
Protist survival is limited mainly by
A) host availability. B) availability of moisture. C) speed at which they can bud off new cells. D) trophozoite size.
In 2011, more than 85% of the ________ grown in the United States was transgenic
A) cotton (only) B) corn (only) C) soybeans (only) D) corn, cotton, and soybeans E) corn and soybeans (only)