A. a geographic separation occurs between subpopulations
Explanation:
Allopatric speciation, which can also be called geographic speciation, is a type of speciation that involves the isolation of biological populations of the same species. This isolation is caused by geographical changes which include, formation of islands, mountains, and bodies of water. Social changes, brought about by human activities such as urbanization and agriculture, also aids Allopatric speciation.
The isolation of subpopulations from each other will lead to the gene flow being interfered or hindered.
HCL in the lumen doesn't digest the mucous because goblet cells in the mucous secrete large quantities of protective mucus that line the mucous surface.
In simple terms, our stomach has enzymes which allow it to be protected against the hydrochloride acid.
The answer to this question is exocytosis! This process allows particles to go through a small hole in the cell wall to enter other parts of your body! I hope this helped
