The principle of conservation of energy states that in a closed system, the total amount of energy a. remains the same b. cannot be measured c. is equal to the amount of matter d. is precious and should not be wasted

The principle of conservation of energy states that in a closed system, the total amount of energy:

A.remains the same

Explanation:

The principle of conservation of energy  says that in a closed system, energy can not be created or destroyed, but it can change form. For a closed system no mass can leave or enter in the system, for this reason there is no energy transfer and for this reason the total amount of energy doesn't change and remains the same in the system.  

"a scientist studying a whale and its surroundings would need to understand the structure of atoms in case something was negatively affecting the whale or its surroundings."

explanation:

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ι вєℓινє тнє αиѕωєя тσ уσυя qυєѕтισи ιѕ в. ℓуѕσѕσмє

ι нσρє тнαт ι ¢συℓ∂ нєℓρ уσυ.