A. Neurotransmitters diffuse across the membrane of neurons
Explanation:
When we begin to move, the brain initially sends a signal to the spinal cord, then the nerve cells in the spinal cord monitor the exact coordination of the muscles. Signal from the brain and the spinal cord directs the movement of leg muscles. Signal is transmitted by release of neurotransmitter from the neuron to the synaptic cleft and its binding to the receptor of adjacent neuron.
B…. It’s been a while but I believe this is it
B they all have the ability to move without any help
1. True
2. Observable, falsifiable, Visible, <span>repeatable
3. Nitrogen oxide and ozone
4. True </span>
Answer:
Polar bears will go extinct by the end of the 21st century.
Explanation:
Polar bears live at the North Pole. Due to global warming, the ice at the poles is melting at an alarming rate. Soon there won't be any glaciers. Without the ice Polar bears will lose their home. The climate on Earth is becoming warmer day by day. So even if the Polar bears survive they will not be able to adapt to the warmer climate. Thus leading to their extinction.
<em>Please mark me as brainliest.</em>