At certain times, the blood builds up high levels of carbon dioxide and has low levels of oxygen. Explain how one or more negative feedback loops can affect the alveoli to maintain homeostasis.
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Ответ:
Amino acids are molecules used to build proteins. All amino acids have a central carbon atom surrounded by a hydrogen atom, a carboxyl group (COOH), an amino group (NH2), and an R-group. It is the R-group or side chain that differs between the 20 amino acids.