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@REPLYADDR Martin Brown
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@REPLYTO 2:5075/128 Martin Brown
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On 14/09/2023 11:18, StarDust wrote:
> On Thursday, September 14, 2023 at 1:12:59 AM UTC-7, Martin Brown wrote:
>> Photosynthetic pigments come in a range of colours but the green plants
>> won the race for supremacy on Earth. It might be different elsewhere.
>>
>>
https://ucmp.berkeley.edu/glossary/gloss3/pigments.html
>>
>> It is an impressive observation and will be even more so if it is
>> confirmed independently by another group of observers.
>
> Algae come in different colors on earth, but some are veri poisonous to life.
You have to remember that they originally evolved in a reducing
atmosphere and the by product of their photosynthesis free oxygen gas
changed all that and radically altered the chemistry of the oceans
laying down vast ore bodies of iron ore and red coloured sandstones.
Anything that couldn`t adapt to that free oxygen environment died out in
the transition between primordial reducing atmosphere and the modern
oxygen rich one. It was much more oxygen rich in the distant past and
able to support super sized insects and more vicious forest fires.
Toxicity to other life forms is a defence mechanism of plants and some
animals. Being highly coloured is a common way of advertising that.
--
Martin Brown
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