One adaptation to flight in birds is lighter bones, which lack
A. collagen.
B. medullary cavities.
C. calcium.
D. the periosteum.
E. bone marrow.
E. bone marrow.
Biology & Microbiology
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How are viroids transmitted?
A. Respiratory secretions B. Sex C. Blood products D. Plant seeds
Biology & Microbiology
__________ 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
Match each type of disease with an example
a. emerging disease b. reemerging disease 1. SARS virus 2. tuberculosis
Biology & Microbiology
Organic chemicals always have a basic framework of the element ________ bonded to other atoms.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology