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Which is not a part of the immune system? a. skin b. stomach acid c. mucus d. fingernails
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White-tailed deer are considered to be an overpopulated species in the central united states. which of these events probably contributed the most to white-tailed deer exceeding their carrying capacity?
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Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion
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Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food
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Which is not a part of the immune system? a. skin b. stomach acid c. mucus d. fingernails...
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