The reproductive system.
Food makes the body active
because it makes it easier to put living things in there place instead of making it complicated:)
Living things are alive.
All living things create waste from food and therefore need to be able to remove it from their system
According to scientists, for a thing to be living it needs cell, tissue,organ and an organ system. Things without even one of these are considered non living. Also a need for water.
Atoms.
Living things are alive.
the sun makes the energy warmer through a system then makes us warmer
living cells
lifethat it is the only planet in the solar system that supports living things and organisms
The simplest human tool is the wheel. It makes it easier to haul and move things. Also hammers are useful for building things. Though I suppose the most efficient human tool is money.
The Earth