Define primary and secondary succesion.

primary can be defined as the process of growth in the area that was previously uninhabited, barren, unoccupied and no initial vegetation.

Secondary success can also be defined as the growth of community in specific areas that were previously occupied and that has primary vegetation but got damaged due to internal or external factors.

Explanation:

answer; polycythemia is the correct answer;

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.