Where do you think the mass of a Giant Sequoia comes from as it
grows?

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.

The answer is Cellulose!!

Explanation:

The mass of the tree comes from the wood (cellulose), and cellulose (by weight) is carbon. Carbon comes from the air (CO2).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.

Hope this helps!! ;)

gold i'm pretty sure i might be wrong