Answer: Option C.
G - alpha subunits stimulating the production of second messenger
Explanation:
Metabotropic receptor is a type of receptor in the Eukaryotic cells that exerts it's action by producing a second messenger. They do not change channels but they exerts it effect by binding and stimulating G protein to produce a second messenger. They can either close or open channels in cell membrane. They are found at the surface of the cells or vessicles.
Marine mammals breed by having coitus
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False. The appropriate enzyme would be DNA helicase.
B) One swims freely and the other often lives attached to a hard surface.
I want to say yellow because it's basically the same color or car lights
