The thin envelope of life that surrounds the earth's surface is called the

A. hydrosphere.
B. atmosphere.
C. biosphere.
D. ecosystem.
E. lithosphere.


Answer: C

Biology & Microbiology

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Your brother has just purchased a new plastic model airplane. He places all the parts on the table in approximately the positions in which they will be located when the model is complete. His actions are analogous to which process in development?

A) morphogenesis B) determination C) induction D) differentiation E) pattern formation

Biology & Microbiology

What are plants that flower only once before they die, normally after two seasons of growth, called?  

A.  annuals B.  biennials C.  perennials D.  monocots E.  dicots

Biology & Microbiology

In the mitochondrion's outer membrane, enzymes and other proteins stockpile which ions?

a. oxygen b. calcium c. hydrogen d. sodium e. potassium

Biology & Microbiology

The highest carbon dioxide concentration will be found in (or at) the

Select one: a. atmosphere. b. trachea. c. alveoli. d. tissue cells. e. blood.

Biology & Microbiology