Which tissue will conduct sugars and organic molecules throughout the plant?
a. Phloem
b. Dermal
c. Xylem
d. Collenchymas
e. Sclerenchyma
a
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The embryo is recognizable as human and is called a
fetus at the end of which week of pregnancy? a. ninth b. twelfth c. sixteenth d. twentieth e. twenty-fourth
Which of the following sequences correctly describes the movement of air in a bird's respiratory system?
a. lungs; anterior air sacs; posterior air sacs b. anterior air sacs; posterior air sac; lungs c. posterior air sacs; lungs; anterior air sacs
d. lungs; posterior air sacs; anterior air sacs e. anterior air sacs; lungs; posterior air sacs
Electrons move about the nucleus of an atom in the same way that
A) insects fly around a bright lamp at night. B) cars are parked along the sides of a street. C) boats cross a lake. D) birds migrate to a new winter home.
PTH is necessary to produce calcitriol (activated vitamin D), which is necessary for the movement of calcium through cells. In this case, how would you characterize PTH?
A) permissive B) antagonistic C) submissive D) synergistic