They are not needed at all, the earth would be much better place without them...
Humans are found on all continents of the world, from the Arctic regions to the deserts and tropical rainforests. The distribution of humans is primarily determined by factors such as food availability, climate, and resources needed for survival.
The layer of Earth's atmosphere vital to life is the troposphere. It is the lowest layer where weather occurs and contains the oxygen needed for humans and animals to breathe.
the structure needed by humans to stand and move is the bone and the muscles
Air on Earth is essential for supporting life. It provides the oxygen needed for respiration in humans, animals, and plants. Air also helps regulate the Earth's temperature and provides protection from harmful solar radiation.
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.
== == If a giant meteoroid hit earth humans would not live any more or animals earth will die.