Prokaryotes Were the Only Organisms for About _________ Billion Years

question 42

Short Answer

Prokaryotes were the only organisms for about _________ billion years after life began on Earth.

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Definitions:

Cholinesterase

is an enzyme that breaks down acetylcholine and other choline esters that function as neurotransmitters, important in muscle function and memory.

Lewy Body

Abnormal aggregations of protein that develop inside nerve cells, contributing to Parkinson's disease and dementia.

Frontotemporal Degeneration

A group of brain disorders caused by the progressive loss of nerve cells in the frontal and/or temporal lobes, affecting behavior, language, and movement.

Protein B-amyloid

A protein involved in the formation of amyloid plaques in the brain, associated with Alzheimer's disease.