A man who is paralyzed from a spinal cord injury might become a father using
A) IVF.
B) a surrogate mother.
C) intracytoplasmic sperm injection.
D) intrauterine insemination.
C) intracytoplasmic sperm injection.
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Which layer of the digestive tract has secretory and absorptive functions?
A. lumen B. mucosa C. submucosa D. longitudinal muscles E. serosa
A difference between a stem cell and a progenitor cell is that
A) a progenitor cell cannot self-renew and a stem cell can. B) a stem cell cannot self-renew and a progenitor cell can. C) progenitor cells are rare but stem cells are abundant. D) progenitor cells are not present in embryos but stem cells are.
Stomata generally open in response to ____
a. the release of abscisic acid by the roots b. a drop in CO2 concentration in leaf air spaces c. exposure to red light d. a drop in O2 concentration in leaf air spaces e. an increase in CO2 concentration in the leaf air spaces
Innate immunity defenses include
a. phagocytosis. b. complement system. c. inflammation. d. fever. e. all of these