Answer:
Algae produced and still produces much of the world's oxygen supply, especially in the atmosphere.
Please give brainliest.
Explanation:
Answer: I think its cells
Explanation:
Viruses dont have cells
Answer:
During the G1 phase, cells synthesize and grow mRNA and proteins for DNA synthesis.
Explanation:
Fats and proteins are the answer
Explanation:
<em>A nerve impulse </em>is a result of a difference in electrical charges across the plasma membrane of a neuron, this difference comes from ions which are electrically charged atoms or molecules.
Before the nerve impulse happens there's a resting potential in the neuron ready to transmit the impulse, this resting potential happens thanks to the sodium-potassium pump that uses ATP to pump Na+ out of the cell and K+ into it, resulting in the inside of a neuron negatively charged.
When a nerve impulse happens (thanks to the receiving of a chemical signal from another cell) a sudden reversal of the electrical charge of a resting neuron occurs, the inside of the neuron becomes positive when the gates in sodium channels open allowing positive sodium ions to flow back into the cell.
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