<span>Intrinsic factor is a glycoprotein principally secreted by the parietal cells of the stomach. This secretion is needed to produce mature erythrocytes. Its secretion is governed by the same biochemical processes that regulate acid secretion and its action is to assist in the absorption of vitamin B12.</span>
Explanation:
Every individual has the same negative effect on population growth rate, independent of density.
The compound eye and eye is built differently from the vertebrate eye