In the carbon cycle, ______ from the atmosphere is used in photosynthesis to synthesize carbon-containing organic molecules in a process called ______.  

A.  carbon dioxide; combustion
B.  carbon dioxide; carbon fixation
C.  hydrocarbons; oxidation
D.  hydrocarbons; cellular respiration


B.  carbon dioxide; carbon fixation

Biology & Microbiology

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Learning has the most influence on behavior when _____

A) making mistakes does not result in death B) animals reproduce asexually C) animals have enormous cognitive ability D) making mistakes result in death

Biology & Microbiology

Four of the five choices listed below are

characteristics of the plasma membrane. Select the exception. a. phospholipid b. fluid mosaic c. lipid bilayer d. inert and impermeable e. hydrophobic tails

Biology & Microbiology

Darwin inferred that those organisms with traits best suited to the environment tend to leave more --- than other members of a population

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Argentine fire ants entered the United States in the

a. 1920s. b. 1930s. c. 1940s. d. 1950s. e. 1960s.

Biology & Microbiology