Biochemistry is the study of .

Biochemistry is the study of atoms, elements, molecules and their chemical reactions in relation to how they create, sustain, and end life. Biochemistry focuses on carbon based biomolecules such as carbohydrates, lipids, proteins and amino acids. Biochemistry will also study how inorganic molecules interact with biological systems either is a positive or negative manner.

An ecosystem is in a certain area and includes living and non living plus there is weather conditions and a biome is a large amount of area with similar climate.so ecosystem is based on weather and biome is based on the average climate