<span>Chemistry can be defined as the study of the composition, structure and properties of matter and the reactions that matter undergoes. Physical Chemistry is concerned with structure of matter, energy changes. ... Matter is the general term for the material things around us.</span>
Is this the answer you are looking for CuCO3=> CuO + CO2.
Well protists quite very as organisms i.e it is hard to say if an organism is a protist. Some main features of protists are that they have
1. A membrane enclosed nucleus
2.They are mainly single celled
Also protista are found mainly anywhere water is present for example damp soil, pools and lakes.
Hope this helps :).