The eyes and the respiratory tract are both protected against infections by _____
A) interferons produced by immune cells
B) the secretion of complement proteins
C) the release of slightly alkaline secretions
D) the secretion of lysozyme onto their surfaces
D
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What are the two components of the human placenta?
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Hydrostatic pressure in plant cells that presses the plasma membrane firmly against the interior of the cell wall, making it rigid is.
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