The 3 main regions of the brain are the cerebrum, cerebellum, brainstem.
Hallucinogenic drugs are drugs such as LSD that produce hallucinations for its users. Another word that is used when referring to the drugs is "psychedelic",, which refers to these hallucinations. The word psychedelic refers to the hallucinations that these hallucinogenic drugs give.
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Fossils are the remains or impression of the dead animals and plants that lived in the past.
C. <span>When water in a lake freezes, it floats, providing insulation for organisms below.
This </span> best describes an effect of the low density of frozen water in a lake.