Question

What is the source of mass means how mass is generated, from where it's come from?

Answer 1

The mass of a tree is primarily carbon. The carbon comes from carbon dioxide used during photosynthesis. During photosynthesis, plants convert the sun's energy into chemical energy which is captured within the bonds of carbon molecules built from atmospheric carbon dioxide and water.

Answer 2

Mass is nothing but a ammont of matter present in it . Mass is always constant and same in whole univers e. Every paticle has a mass . Even though minutest ,quantam particle gas also mass.