Explanation:
if we will grow huge number of trees and other plants the oxygen level will increase because tree produce oxygen during the process of photosynthesis and if one gases level will increase then other will also decrease...
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Answer:
The main function of the circulatory (or cardiovascular) system is to deliver oxygen to the body tissues, whilst simultaneously removing carbon dioxide produced by metabolism.
<span>Any type of pharmaceutical product or dietary supplement must be tested in clinical trials before they can be marketed in order to assess their safety for the general public's consumption and to confirm their intended purpose. While not a complete fail safe, these tests intend to prove a reasonable sense of safety for the product.</span>
<span>nerve cells need b 12 for proper functioning</span>
