Sea otters have been used as an example of the "Keystone Species" concept. This means that sea otters 

A. are the base of the food chain in their ecosystem.
B. are the dominant species in their ecosystem.
C. exert a strong influence on the structure and functioning of their ecosystem.
D. have been recently introduced and are recruiting other new species to the ecosystem.


C. exert a strong influence on the structure and functioning of their ecosystem.

Biology & Microbiology

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The structure that easily distinguishes a plant cell from an animal cell is

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The main visual pigment in rods is:

a. anthocyanin b. chlorophyll c. hemoglobin d. rhodopsin e. xanthophyll

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Which pair demonstrates a mutualistic relationship?

a. orchid and its host b. rhizobia and strawberry plants c. soil fungus and soil bacteria d. mistletoe and its host e. mychorrhizae and roots

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Which of the following Excavata members have hydrogenosomes?

A. Euglenozoa B. Fornicata C. Trichomonadida D. Trichonymphida

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