Explanation:
Trees, like all plants, use the energy of sunlight to take carbon dioxide (CO2) from the air and water from the ground through the mechanism of photosynthesis. They release oxygen into the air during the process of turning it to wood.
and no- this is not copied :)
The state of maintaining a stable internal environment regardless of changing external conditions is called 
.
If there are respiring organisms within that sample of air, the partial pressure of oxygen decreases because the organisms utilize it for respiration activities.
They form an organ
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Answer:
<h2>measures the pressure of blood when the heart contracts and relaxes.. </h2>
