All living things must be able to adapt to their environments in some way in order to survive. As external environments change, like with seasons, the internal conditions of living organisms must change as well. These internal changes allow organisms to maintain temperature, hydration, and overall health. Which of these is the best example of a living thing showing this characteristic?

A) A mother lion nurses her cubs in the safety of a den.
B) A bear's heart rate lowers to conserve energy during winter.
C) A pupa forms around a caterpillar as it morphs into a butterfly.
D) A squirrel collects and stores acorns and nuts in a tree for winter.

a- all cells come from pre-existing cells

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

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.