Neptune's High-Altitude Clouds Are Probably Made of Frozen Methane

question 15

True/False

Neptune's high-altitude clouds are probably made of frozen methane.

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Definitions:

Histamines

Compounds involved in local immune responses as well as regulating physiological function in the gut and acting as neurotransmitters.

Receptor Sites

Specific regions on the surface of a cell or within a cell to which specific molecules, such as hormones or neurotransmitters, can bind.

Morphine

A potent opiate analgesic drug derived from opium used to relieve severe pain.

Endorphins

Naturally occurring chemicals in the brain that reduce pain and boost pleasure, resulting in feelings of well-being.