Choanocytes are found in ____ and participate in intracellular digestion
a. birds
b. earthworms
c. grasshoppers
d. humans
e. sponges
ANSWER: e
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Which pair correctly associates a physiological process with the appropriate vitamin?
A) blood clotting â€" vitamin C B) normal vision â€" vitamin A C) synthesis of cell membranes â€" vitamin D D) production of white blood cells â€" vitamin K
__________ refers to nutrient enrichment of any
ecosystem that is otherwise low in nutrients. Fill in the blank(s) with the appropriate word(s).
Carnivorous plants have evolved mechanisms that trap and digest small animals. The products of this digestion are used to supplement the plant's supply of _____
A) energy B) carbohydrates C) lipids and steroids D) nitrogen and other minerals
Which of the following objects must be the same sign as the covariance of variables X and Y?
A. Unconditional correlation of X and Y. B. Semi-partial correlation of Y and X holding Z constant. C. Partial correlation of X and Y holding Z constant. D. Semi-partial correlation of X and Y holding Z constant.