How many half-lives occur in 4 hours?
A. 1
B. 2
C. 3
D. 4...
Answers: 2
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Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine
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Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?
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