That is a very good question, especially when it's actually more advantageous for people to be nice to each other and especially to the earth. People kill animals to eat them. They kill each other for numerous reasons. They are not responsible in taking care of the earth because they don't know any better or they don't care. Companies may not take care of the earth due to monetary gain for which taking care of the earth may get in the way of.
Biology is the study of every living thing on earth.
no, some people lie and spread things around that people think are true but aren't
water
No, immortal people are people who could not be killed. They are invincible and nothing can kill them. Be aware that immortal people can kill exactly every living thing on Earth.
It Dies (ceases to be a living thing).
Biology
gravity
gravity
every thing would float around.
The same as it is to every other thing on this earth.
every thing
gravity