Calcium is one substance that is secreted elsewhere but not in the proximal convoluted tubule.
<h3>Renal reabsorption and secretion</h3>
Renal reabsorption is defined as the movement of water and specific solutes from the renal tubule back into the plasma.
Renal secretion is defined as the process by which waste ions and hydrogen ions pass from the renal capillaries into the renal tubule to be excreted into the urine.
At the proximal convoluted tubule, calcium is reabsorbed but not secreted. Therefore, Calcium is one substance that is secreted elsewhere but not in the proximal convoluted tubule.
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Answer:
B. Without greenhouse gases, Earth would be too cold for life to exist.
Explanation:
Greenhouse gas (carbon dioxide) can reflect sunlight back to earth so it keeps the energy and make the planet warmer. Too many greenhouse gases make the planet too hot and cause global warming, but if its too little then the planet will be colder.
Colder temperature can also be dangerous as it will kill many organisms that can't resist it. The ideal condition should be in between, not too hot and not too cold.
Machines do things more efficiently, Just use time, It gets in the way of work,
