What's unusual or unexpected about leaves turning red?

Fluctuations in the soil and air around plants upset nutrients and cause red pigments. Cool spring air and cold soil often produces red and purple foliage tints. In summer, extremes of high heat followed by cooler temperatures cause nutrient imbalances.

Explanation:

So far there's nothing unusual or unexpected in red leaves since it's natural. Leaves merely turn to red when the subject is stressed. Most often from too-cool temperatures, but sometimes by improper irrigation, low nutrients or acidic soil. Red leaves are known to be seen during spring or fall.

Explanation:

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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.