Answer:
The scientist is studying oxygen which can also be found in protien. oxygen is the element which makes up to 65% of human body mass. It is also found in proteins inside the body.
Answer:
I think it is sugar, as it is using sugar to grow.
They were adapted to an environment and once it is taken away the plants will slowly start to die. I'm not 100% :)
the human body is always at work and using all organs the bodys largest organ is the skin
