Which of the following is an example of a positive feedback loop?

a. maintaining body temperature
b. blood pH levels
c. uterine contractions during childbirth
d. blood glucose levels


c. uterine contractions during childbirth

Biology & Microbiology

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On reaching the oocyte, a human sperm cell must pass through what layer(s) before it can fuse with the plasma membrane of the egg?

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The minimum concentration of antibody produced by

the primary immune response occurs between weeks a. 2 and 3. b. 3 and 4. c. 4 and 5. d. 6 and 7. e. 9 and 10.

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Coniferous forests are found in all of the following locations EXCEPT

A. the Pacific coast of North America. B. northern Africa and the extreme southwestern United States. C. coastal areas of the southeastern United States. D. the northern part of North America and Eurasia.

Biology & Microbiology

ribososmes

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Biology & Microbiology