The third answer...Are there more?
From: [log in to unmask] (Ray Ritchie)
To: [log in to unmask]
Date: 97-04-03 00:41:46 EST
(1) is wrong, an unfortunate urban fable. A lcosely related fable
is that a few litres of algae can supply enough oxygen for a man such as an
(2) another fable.
(3) Partially correct. Filamentous prokaryotic cells resembling
modern blue-green algae go back about 3 billion years. Most ancient "algae"
were photosynthetic bacteria that use light to fix carbon but do not
envolve oxygen. Blue-green algae have an oxygen-evolving photosynthetic
mechanism essentially similar to higher plants. Benn around for at least 2
billion years. Look in a good Biology Text Book for 1 st year students.
I am a post-doctoral in algal photosynthesis and bioenergetics.
Raymond J. RITCHIE
Biology A-12, The University of Sydney,
Sydney, NSW 2006, Australia.