Here's why:

* Synthesis is the process of building complex molecules from simpler ones. This is essential for life because organisms need to create the components they are made of, like proteins, carbohydrates, lipids, and nucleic acids.

* Cells are the fundamental building blocks of all living organisms. They use the products of synthesis to build their structures, carry out metabolic processes, and grow.

* Tissues are groups of similar cells that work together to perform specific functions. The materials produced by synthesis are used to build and maintain these tissues, contributing to the overall structure and function of the organism.

For example:

* Proteins synthesized from amino acids are used to build enzymes, structural components, and signaling molecules.

* Carbohydrates synthesized from sugars provide energy and can be used to build cell walls.

* Lipids synthesized from fatty acids form cell membranes and provide insulation.

* Nucleic acids synthesized from nucleotides store genetic information and are essential for cell division and protein synthesis.

Therefore, the products of synthesis are essential for the growth, development, and maintenance of all living organisms.