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
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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
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
In the mitochondrion's outer membrane, enzymes and other proteins stockpile which ions?
a. oxygen b. calcium c. hydrogen d. sodium e. potassium
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.