The heart is an example of

A. a tissue.
B. an organ.
C. an organ system.
D. both A and B


Answer: B

Environmental & Atmospheric Sciences

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What two activities use the most water for a typical North American family of four?

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Which of the following contains two species which have the same mass number?

A) 14C, 14N B) 12C, 13C C) both a and b D) neither a nor b

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Although the Valley and Ridge province of the Appalachians is characterized by intensely folded rock, it is not the structures themselves that are resulting in the ridges and valleys

What rocks make up the Valley and Ridge province, which ones make each landform (ridges or valleys), and why? What will be an ideal response?

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The crests of mid-oceanic ridges are associated with ________.

A. barrier reefs B. Benioff zones C. pelagic sediments D. rift valleys E. abyssal plains

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