Air becomes deoxygenated during the ____ of a bird’s respiratory cycle
a. first inhalation
b. first exhalation
c. second inhalation
d. second exhalation
e. third exhalation
ANSWER: b
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Chemoheterotrophs
A. use sunlight as an energy source. B. use preformed organic molecules as a carbon source. C. use preformed organic molecules as an energy source. D. use inorganic chemicals as an energy source. E. use preformed organic molecules as a carbon source AND as an energy source.
Cleavage produces a __________ stage cell. Fill in the blank(s) with the appropriate word(s)
The base of the detrital food chain is formed by
A) primary producers. B) decomposers. C) herbivores. D) dead organic matter.
Which of the following processes could a scientist use to make an amount of DNA that is large enough study?
A.) polymerase chain reaction B.) genetic engineering C.) bioinformatics D.) gel electrophoresis