I don’t think there is a limit in science because we didn’t discover even half of the ocean.
Scientists who do this are doing what is considered to be and called cloning. Cloning is exactly this - taking cells from one organism and trying to produce and recreate an identical (from a genetic perspective) organism.
This can be done in a routinely fashion but there are serious ethical considerations nowadays.
The statement is true I learned that in pre schoollol
The stomata (or singular, stoma) diffuse carbon dioxide and oxygen through the plant, taking in CO2 and producing O2 for us the breathe.