4. What role do the muscles and blood vessels play in the negative feedback loop of thermoregulation? A) integration centers B)sensors
C)stimuli
D)effectors

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

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During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water