Answer:
Gas exchange is crucial to sustain life because it rids the body of carbon dioxide and provides oxygen to the body.
Explanation:
Gas exchange in living beings is a mechanism that involves the incorporation of oxygen (O₂) into the organism and the elimination of carbon dioxide (CO₂). This exchange takes place in the pulmonary alveolus and in cells and tissues.
- <em><u>During respiration, the inspired air - loaded with O₂ - is exchanged with the CO₂ contained in the blood, taking advantage of the former and eliminating the latter during expiration</u></em><em>.
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- <em>When the oxygenated blood is taken to the tissues, O₂ is passed to the cells, which are deprived of the CO₂ produced by metabolism.
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The reason why gas exchange is crucial for the sustain of life is because it is the mechanism that allows the entry of O₂ necessary for cellular functions, as well as providing a means of CO₂ elimination.
The answer is electrons.
A covalent bond is a type of chemical bond where atoms share electrons. Covalent bonds are also referred to as molecular bonds because they form molecules when bonded.
This type of bond occurs between non-metals. An example of a compound or a molecule that is formed through covalent bonding is water. It is a combination of two hydrogen atoms bonded with an oxygen atom. H₂O
Vitamins work with Minerals to initate chemical reactions within cells.
Answer:
whatever
Explanation:
<em>typically, the thumbs are left uncrossed--but this would mean the same thing</em>
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These hands are positioned in a shape of a "W", typically standing for "whatever"
It means what "whatever" would mean if you say it--a general lack of care/that something has no effect [on you specifically]
note: this was used in the movie <em>Clueless</em>, and that's when it became more popular, so this also could be a reference to that scene
(if you want to look it up (I can't give links), you could look up something like <em>Clueless RSVP</em>)
<em>Sometimes, this is confused with a "w" made using one hand, which typically means "win"</em>
hope this helps! have a lovely day :)
