Examlex
Which of these is required for natural selection to occur?
Rapid Eye Movement
A phase of sleep characterized by quick, random movements of the eyes, dreaming, and increased brain activity.
Neurotransmitters
Neurotransmitters are chemical messengers in the brain that transmit signals across synapses from one neuron to another, influencing mental processes and behavior.
Motor Nerves
Nerves that carry signals from the brain to muscles to facilitate movement.
Hydrocarbons
Organic compounds consisting entirely of hydrogen and carbon, and are the basic constituents of many fuels, plastics, and synthetic materials.
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