How much of the oxygen we breath is produced by phytoplankton?

0 ⤊

20%, 35%, 50% or 70%?

2007-01-18 05:48:35 · 3 answers · asked by Ahhhhh 1 in Environment

I am sure that all oxygen has come from a plant in the last 4 million years. I don' t know of anything that recycles the CO2 to oxygen but plants.

2007-01-18 07:55:54 · answer #1 · answered by JOHNNIE B 7 · 0⤊ 0⤋

It's 50%.

2007-01-18 06:10:43 · answer #2 · answered by squalisdomestica 2 · 0⤊ 0⤋

It's pretty dang large. I've heard some figures say up to 90%.
But I'm not sure where they got their info.

2007-01-18 05:53:53 · answer #3 · answered by ? 4 · 0⤊ 0⤋