Responding to the environment is a characteristic of life best shown by which example?
O
O
O
a human shivers on a cold day
a horse trots in a field
a dog swims in a pond
a cat licks its paws

try a human shivers on a cold day that should be correct.

Explanation:

answer; ///(b) it is composed of four protein chains and four heme groups;

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.