What are the chemical weapons involved with the first line of defense?
A. mucus and cilia lining the respiratory tract
B. saliva and digestive enzymes
C. oil and sweat glands within the skin
D. All of the choices are correct.
Answer: D
Biology & Microbiology
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The bones of the vertebrate skeleton are connected by flexor joints
Indicate whether the statement is true or false.
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____________________ traits are controlled by two or more genes and significantFill in the blank(s) with the appropriate word(s)
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The living plants that are most similar to the first plants to bear gametangia are the _____.
a) seedless vascular plants b) charophyceans c) bryophytes d) gymnosperms e) angiosperms
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