One of the best exercises for people with leg or foot problems is running.

a. true
b. false


b. false

Biology & Microbiology

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__________ moves food down the esophagus and through a(n) __________ (a ring of muscle that can close off an

opening) into the stomach. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

All of the statements below are true. Select the statement that best supports the view of most biologists that viruses are nonliving.

a) The viral genome may be single-stranded or double-stranded RNA or DNA. b) Viruses are obligate intracellular parasites. c) An isolated virus is unable to replicate its genes or regenerate ATP.

Biology & Microbiology

A developmental theory is a systematic statement of general principles that provides a framework for understanding how and why people change as they grow older.

Indicate whether the statement is true or false.

Biology & Microbiology

RNA is believed to have preceded DNA because _____.

A. DNA contains thymine and RNA does not. B. DNA is double stranded and requires more components. C. DNA can store more protein-building instructions in less space. D. RNA can also function as an enzyme. E. RNA cannot replicate itself.

Biology & Microbiology