Here this is what I found:)
Blood vessels, ligaments, muscles, and skin pigment.
I think it is light, chemical. Light comes from the sun to plants, and plants turn the light (among other things) into glucose, a chemical.
The cell cycle, or cell-division cycle, is the series of events that take place in a cell leading to its division and duplication of its DNA (DNA replication) to produce two daughter cells.
