They are not needed at all, the earth would be much better place without them...
the structure needed by humans to stand and move is the bone and the muscles
Humans live on the lithosphere, or the crust, of the earth.
No, actually plastics are harmful to most living organisms on earth, including humans (depending upon the plastic). Plastics are a very recent invention of humans, and outside of human convenience are not needed in any way, shape or form.
Humans are traveling at the same speed as the earth.
No. The only place where there are humans is on Earth, or in low Earth orbit.
Humans hurt the earth more.
No, it is not for only humans. It existed long before humans appeared and will exist long after we are gone; in that time, it has, is and will support hundreds of millions of other types of organism.
The humans came to earth from a "big bang" long time ago.
Humans are put on the Earth to do illegal things all day long. By Audrey
== == If a giant meteoroid hit earth humans would not live any more or animals earth will die.
Humans give this planet life
earth