Answer:
It cannot be digested and, therefore, provides little nutritional value
W. Adenine / Thymine. B. Guanine / Thymine / Cytosine.
In your body<span>, the excretory system helps to keep salts and urea from building up to dangerous levels and becoming toxic. The kidneys are two bean-shaped organs that </span>remove these<span>toxins from your blood and produce urine to carry them from the </span>body.<span> </span>Waste<span> products must be </span>removed from the body<span>. If they are not, they will increase in concentration and may interfere with chemical reactions or damage cells. </span>Waste<span> products that must be </span>removed<span> include carbon dioxide and urea.</span>
Stimulated by the action of the ions on its receptors, the pump transports them in opposite directions against their concentration gradients. ... The sodium-potassium pump carries out a form of active transport—that is, its pumping of ions against their gradients requires the addition of energy from an outside source.