Living things keep the proper condition inside in a number of ways. Organisms use osmosis to control molecule intake, and temperature controlling mechanisms.
Carbon doesn't get into living things. All living things are constituted of carbon. This is why we have carbon inside us.
Biologist
Neon is chemically inert. It doesnt react with any other element and (to the best of my knowledge) has no role in living things. So I would comment that the element neon is not found inside living things.
Plants.
organelles
Answer: Living space, energy, H2O, proper temperature, air, nutrients. not all living things need air to live
Viruses depend on living cells because they reproduce inside of them.
There is some debate about the status of a virus, whether it is living, not living, or some intermediary condition.
Every living creature needs to breath to live.
energy, food and water, oxygen, living space, proper temperatures.
proper temperature, living space, food and water, oxygen, and sunlight
Sodium is found in table salt, battries and streetlights. Although these are not living things, i dont think sodium is found in living things. Although it may be in plants!