Something is alive if it can reproduce, respond to changes in its environment, can convert some form of energy into energy to sustain its self, and produces waste.
A fish tank would be considered an ecosyestem because there is a living thing in it. (the fish)
No. The sun is not a living thing.
No. A salt crystal is not considered a living thing.
A tree, which doesn't move away, is considered a living thing because it has cells. So, all living things have cells wether they move or not, or else they would NOT be living.
A nuclear reaction is not considered a living thing.
It is non-living!
Living thing. Since a seed is in a living thing, it is living. Most likely, that is your answer.
yes
Technically, hair is made up dead skin cells, so I don't think it would be considered a living thing.
A tree, which doesn't move away, is considered a living thing because it has cells. So, all living things have cells wether they move or not, or else they would NOT be living.
Because it has cells. Anything with cells is considered living.
air is a non-living thing because it is not an organism and it has no cells.