★ Digestive System Quiz
Where does the absorption of nutrients from food take place?
A. stomach
B. liver
C. small intestine
D. large intestine
Select your answer:
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Reproduction › ViewHow many sperm cells is produce by a male plant?
A. 1
B. 2
C. 3
D. 4
Excretion › View
Mammals have evolved a sophisticated mechanism for eliminating nitrogenous waste that involves:
A. secretion through cell membranes
B. forming urea and storing it in concentrated solution
C. producing uric acid and excreting it with feces
D. recycling urea and using it as an energy source