Mass cannot be created nor destroyed as well.
So, energy just goes into other things.
Example: you are born. You have carbon dioxide in your body, (or star dust). When you die, your body releases that gas.
Make sense?
I hope this helps! (:
Answer:
i think
they are used to male the animal grow
Answer:
the would test random expirements
Adaptation actually and also following control measures on how to avoid it from happening
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