What are bacteria? How do
they affect the environment?

Bacteria is like a virus. Bactria can affect the environment because, many plants and animals can carry it. If that biosphere gets in contact with another, it can spread to the other biospheres and can cause them do die.

Explanation:

i think the answer is gold im not entirely sure

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.