Anybody who can relate??? It is true, I know that

and people like that hide their feelings because nobody cares about them...
I tried telling a person about my bad day but that that that person said they didn't care...I realized that how much I care for that person but they don't.
But it's okay, even if the whole world doesn't care about us, we always will.​

d

Explanation:

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.