Question

how does our level of energy changes with time?​

Answer 1

Answer:

Many energy forms from nuclear power plants

....... from wind

Etc..

Hope it will help you

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Answer 2

ANSWER:

Level of energy does not remain the same and depends on the work we perform and it is because of the amount of energy we contribute to performing certain tasks.

EXPLANATION:      

The level of energy varies as we undergo work that requires a high amount of energy within a particular time. This makes our body loses strength and feels tired quickly. So that almost half of our energy has been spent on it and we relatively feel tired.