Question

responding to the environment is a characteristic of life best shown by which example? a human shivers on a cold day a horse trots in a field

Explanation:

Responding to the environment means an organism reacts to external stimuli. When a human shivers on a cold day, it's a reaction to the cold (an environmental stimulus). Shivering helps generate heat to maintain body temperature. A horse trotting in a field is more of a voluntary movement (not directly a response to an environmental stimulus like temperature change, etc., in the context of showing the characteristic of responding to the environment as clearly as shivering due to cold).

Answer:

a human shivers on a cold day