Which statement best describes the function of the respiratory passageways of a human?
A. They permit digestive end-products to make contact with body cells.
B. They permit exchange between the external atmosphere and the circulatory system.
C. They transport gaseous cellular wastes from body cells to the lungs for excretion.
D. They regulate the amount of ammonia and salt dissolved in body fluids.
Select your answer:
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Nature of Science › ViewWhich of the following characteristics of living things best explains why some North American birds fly south for the winter?
A. evolution
B. response to the environment
C. energy and ability to metabolize
D. reproduction
Biochemistry › View
Which of the following is responsible for protein tertiary structure?
A. Phospholipids
B. R group side chain interactions
C. Peptide bonds
D. Nucleotides