They are all part of the digestive system, they all break down food, they all have enzymes
The atmosphere also protects living things on Earth from the sun's harmful ultraviolet radiation. A thin layer of gas called ozone high up in the atmosphere filters out these dangerous rays. The atmosphere also helps to sustain life of Earth.
Plants get nitrogen by absorbing it from soil through its roots.
If they are negative and positive then they are attraction if the are the same then they are repulsion.
Hope this helps. Have a nice day.
