It is b the continent shifted towards the tropics <span />
The answer would be: <span>secretes mucus that is not identical to stomach mucus
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Stomach cell lining is protected by a thick mucus that prevents the acid from destroying the epithelial cells. But the mucus that secreted by the esophagus is different than the stomach. That makes esophagus can't protect itself from the stomach acid.
A. mitosis produces 2 genetically identical diploid daughter cells from one parent cell.
The correct answer is lactic acid fermentation.
Lactic acid fermentation refers to a metabolic procedure by which glucose and other six-carbon sugars, like lactose or sucrose are transformed into cellular energy and the metabolite lactic acid that is a lactate in solution.
It is an anaerobic fermentation reaction, which takes place in certain kinds of bacteria and animal cells, like muscle cells.
