What Was Needed to Develop in Earth's Atmosphere to Protect

question 31

Multiple Choice

What was needed to develop in Earth's atmosphere to protect organisms from the harmful effects of ultraviolet radiation?

• A) weather patterns
• B) a nitrogenous layer
• C) a greenhouse effect
• D) an ozone layer
• E) reflective clouds

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Definitions:

Neurotransmitter

Chemical substances in the brain that transmit signals from one neuron to another, influencing various functions such as mood, memory, and movement.

Synapse

The junction between two neurons or between a neuron and a muscle where neurotransmitters are released to transmit impulses.

Synapse

The junction between two neurons or between a neuron and a muscle where impulses pass by diffusion of a neurotransmitter.

Postsynaptic Membrane

The postsynaptic membrane is the region of a neuron that receives neurotransmitters from another neuron across the synaptic gap, playing a crucial role in neuron-to-neuron communication.