In the case of temperature regulation, an example of an effector is

a. a receptor in the brain.
b. a center in the brain.
c. a shivering skeletal muscle.
d. none of the above.


c

Biology & Microbiology

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Which microbial grouping is the major oxygenic phototroph in most salt lakes?

A) cyanobacteria B) Dunaliella, a eukaryotic alga C) halophilic Archaea D) purple nonsulfur bacteria

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List the four types of gymnosperms. What characteristics do they have in common? What sets each group apart?

What will be an ideal response?

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All of the ____ are a community. 

A. sugar maple trees on Earth B. living organisms in a forest C. squirrels in a forest D. living and nonliving things in the forest

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Blood vessels that serve as gateways to capillary beds are ________

A) venules B) arterioles C) arteries D) veins

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