Answer: D. Cancer
Cancer is when cells grow at an abnormal and uncontrolled rate.
Answer:
gas particles are very losely packed then liquid
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:
Photosynthesis and cellular respiration allow the carbon and oxygen that organisms consume and produce to be cycled through the ecosystem. They work together so that what is made from one process is used in the other. Without them the ecosystem would run out of carbon dioxide and oxygen, and everything would die.
I would say D it seem to be the likely choice but not a 100%