Answer:
Option A. Air pollution can cause water pollution.
Explanation:
Substances can permeate into the water from the air.
Answer:
The processing of what requires the most amount of energy from the body is metabolism.
Explanation:
metabolism is the chemical reactions in the body's cells that change this food into energy.
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The cells of SA node acts as the heart's peacemaker which establishes the pace for cardiac activity.
Sinoatrial node is also called sinus node.
SA node is termed as a group of cells which are located in the wall of the right atrium of the heart. Cells have the ability to produce electrical impulse. It travels to the heart via electrical conduction system which causes it to contract.
It produces action potential and also sets the rhythm of the heart.
