The movement of oxygen through the aquatic plant may depend on
A. aerenchyma tissue.
B. differences in the water potential of different tissues.
C. negative pressures created by transpiration.
D. aquaporins.
E. osmotic absorption by the roots.
Answer: A
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Approximately ________ million years ago the amniotes branched off from their amphibian ancestor
a. 300 b. 250 c. 355 d. 180 e. 425
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