Red algae contain ________, which absorb(s) blue-green and green light, allowing the algae to live in deeper water
a. phycobilins
b. carotenoids
c. chlorophyll a
d. chlorophyll b
a
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Functions of the mantle in clams include
(a) secreting the shell. (b) forming pearls around irritating grains of sand. (c) forming the incurrent and excurrent siphons. (d) all of the above.
Sponges often compete with other organisms for:
a. food. b. space. c. light. d. nutrients. e. mating.
The urinary system helps to maintain the extracellular fluid pH by ____
a. synthesizing buffers b. retaining carbon dioxide in the filtrate c. excreting excess hydrogen ions d. combining hydrogen ions with urea e. excreting filtrate
If you swim underwater for 200 yards you would expect:a
the of the air in the alveoli to increase. b. the in the tissues to increase. c. the of the air in the alveoli to decrease. d. the in the tissues to increase. e. the of the air in the alveoli to increase and the in the tissues to increase.