Homo erectus represents a different kind of hominin than the more ancient african predecessors. one of the reasons is

One of the reason is : An increased body size and robustness. They have long spatial/temporal range , they were the first hominin to leave Africa, they have modern human body proportions , they were the first to have a protruding human nose and they actively were hunting.

well the answer is 2!

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.