The blank states that the processs that have been occurring today have been occurring since earth formed

The Uniformitarianism states that the process that have been occurring today have been occurring since earth formed .

Explanation:

Uniformitarianism is the slow incremental changes in the earth crust. The present is the key to the past’ is key for the changes occurred and  created all the earth’s geological features; this concept is also known as the doctrine of the uniformity.

Its  states that the natural law that we processed and implemented that operated in our present day is the scientific observation have always operated in our past and applied everywhere in our past. The examples of the Uniformitarianism is the volcano erupt, lava spew. etc ...

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.