This is because there is carbon dioxide (CO 2 ) exchange in the atmosphere, which leads to constant turnover of carbon molecules within the body cells.
(This; is; because there is carbon dioxide (CO 2 ) exchange in the atmosphere) (the atmosphere; leads; to constant turnover of carbon molecules within the body cells)
This the atmosphere
is leads
because there is carbon dioxide (CO 2 ) exchange in the atmosphere
to constant turnover of carbon molecules within the body cells