To maintain homeostasis, a cell needs to expel some of its water. Which structures below would most likely help accomplish this task?
A. pseudopods
B. protein pumps
C. tunnel proteins
D. contractile vacuoles
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A student makes a slide containing numerous specimens of this protist. After leaving the light on for several minutes, she observes that most of the protists have moved to the brightly illuminated part of the microscope slide. What is the best explanation for her observations?
A. The protist shows no response to light.
B. The protist uses light for autotrophic nutrition.
C. The protist uses light for asexual reproduction.
D. The protist uses light for heterotrophic nutrition.
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