Alright, so mass is a property of a physical body. During physical changes, such as acceleration, force, etc, the mass stays the same since we are not affecting its physical shape, just where it is physics wise. So yeah mass is conserved during a physical change.
(This is very confusing I'm bad at explaining things sorry)
Answer:
I think the dugong since it's bigger
The elements are pure forms of matter that cannot be broken down into simpler substances.
Answer:
A choosing to burn coal to generate electricity
Explanation:
Neither nuclear energy nor alternative sources such as wind and solar seem likely to meet the demand for electricity. ... Of all fossil fuels, coal puts out the most carbon dioxide per unit of energy, so burning it poses a further threat to global climate, already warming alarmingly.
