Question

a lion eating a zebra is an example of which characteristic of life?
responding to the environment
using energy

Explanation:

When a lion eats a zebra, it is obtaining nutrients and energy from the zebra. All living organisms need energy to carry out life - processes such as growth, movement, and reproduction. Eating (consuming food) is a way for organisms to get the energy they need. Responding to the environment would be more about how an organism reacts to external stimuli like a plant growing towards light or an animal running away from a predator. But in the case of a lion eating a zebra, the key characteristic related to life here is the use of energy as the lion will use the energy from the zebra for its own life - sustaining activities.

Answer:

using energy