Organisms are classified as living things, rather than nonliving things, based on specific characteristics. one of those characteristics is the ability to grow and change. 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.