This is false!
Carbon is found in many substances!
For example, we breathe out carbon (Carbon dioxide) and as a result, there is an amoung of carbon in the air.
Carbon is also found in many rock types, such as in coal.
Immune System is the system that consists of proteins and cells.
I think it is the nervous system
Chromosomes are made up of two sister chromatids , and are then dispersed as chromatin which is the DNA making up the chromosome.
