[RightWhale]

Oxygen carrying is done by hemoglobin, chlorophyll, and the goo that crabs use for blood. Retinal—what is that?—what is in the retina of the eye?

[NormsRevenge]

Dude, I’m playing the Sgt Schultz line. I KNow nutzing about microbes!

Thanks gosh for search engines..

Extreme Halophiles Are Models for Astrobiology

http://www.asm.org/microbe/index.asp?bid=41227

[antiRepublicrat]

Oxygen carrying is done by hemoglobin, chlorophyll, and the goo that crabs use for blood. Retinal—what is that?—what is in the retina of the eye?

Yes. It's a molecule, light in, electricity out, much simpler than a chlorophyll molecule.

And chlorophyll doesn't carry oxygen like blood does. It powers a chemical reaction that breaks down CO2 and water to produce sugars for energy and O2 as a waste product.