Re: Pt. 9 Louis Agassiz - Darwin's Contemporary

Helllllppp wrote:
And for you, Mr. John Harshmann. Who needs lichens, when our modern
world is abundant with examples of plant species / those "pesky"
bacteria that thrive so well in the dark! 3.5 billion years of
life... amazing, isn't it?

Yes, it's amazing. I'm not sure what your point is, if any.

~ pubmedcentral.nih.gov/articlerender.fcgi?artid=2526175

"This suggests that early biofilms formations which pre-dated the
evolution of photosynthesis might be more transient and delicate than
later forms, in keeping with the slow development of stability in the
dark incubation in the present study. However, the metabolic process
carried out by non-photosynthetic bacteria may still have been
influential on the formation of carbonates and evaporites [13], [23]–
[26]. The advent of photosynthesis and the capacity of biofilms to
produce organic molecules is likely to have worked in tandem with
existing non-photosynthetic organisms increasing the likelihood of
stromatolite formation. The role of the varied organic molecules
associated with biofilms, microbial mats and stromatolites is
continuingly being investigated and expanded [18], [19]."


PHOTOSYNTHESIS... NAH, THE EARTH DID NOT NEED THE SUN... HERE'S THE
EVIDENCE THE EARTH CAN PROVIDE ENERGY FOR PHOTOSYNTHESIS ON ITS OWN...
WITHOUT THE SUN.

No need to shout. I can hear you.

"Discovery of green sulfur bacteria living near hydrothermal vents has
major implications for where photosynthesis happens and where life may
reside A team of researchers, including a photosynthesis expert from
ASU, has found evidence of photosynthesis taking place deep within the
Pacific Ocean. The team found a bacterium that is the first
photosynthetic organism that doesn’t live off sunlight but from the
dim light coming from hydrothermal vents nearly 2,400 meters (7,875
feet) deep in the ocean."
Researchers find photosynthesis deep within ocean Jun 21, 2005 ...
Researchers find photosynthesis deep within ocean ... One is what it
means to life on Earth; the other is what it means about where to
look ...
~ asu.edu/feature/includes/summer05/readmore/photosyn.html

Question: without the sun, would we have liquid water oceans? Would we have hyrdothermal vents, which rely on the existence of liquid water oceans?

WHY THE CAMBRIAN EXPLOSION?

ASK "WHY". 3.5 billion years of bacteria and even single cell
organisms, stagnating, doesn't feed the bulldog. It flies in the face
of evolution theory itself. The planet should have been crawling with
life, 3.5 billion years ago.

It was crawling with life. Just not metazoan life. Your parochial worldview is seriously naive. Bacteria show immense diversity, all by themselves. So do single-celled eukaryotes. And even metazoans predate the Cambrian explosion by at least 50 million years, probably more.

The explosion is an interesting biological question. Why then? Why not earlier? But your answer is just pure insanity. I have a preferred answer of my own. It's no more than a notion, and we may never know the real cause, but at least my answer isn't insane. I think the explosion marks the origin of predation (macrophagy), and records an arms race between predators and prey. This explains the near-simultaneous invention of hard parts in many independent lineages, some of them body coverings and some just teeth or jaws. More than anything else, the Cambrian explosion is an explosion of durable skeletons. There were also apparently advances in sensing -- eyes, in particular -- and motility, both also potentially explainable as adaptions to predation or predator avoidance.

So why not earlier? There are various suggestions. Increases in free oxygen, emergence from a snowball earth, a change in carbonate balance in the oceans, some key innovation that was evolutionarily unlikely. I don't know myself. But again, your idea is pure insanity.

.

Relevant Pages

  • Pt. 5 - Genesis and Scientific Evidence
    ... planet exposed to photosynthesis for 4 billion years, ... Life should have proliferated at an astronomical ... to just sit there under photosynthetic sunlight "doing ... bacteria goes to work on it, ...
    (talk.origins)
  • Re: Photosynthesizing bacteria
    ... and are closer than any other bacteria to plant-style ... photosynthesis; it is believed that plants evolved directly from ... SuperOxide Dismutase and Catalase in all life today. ... geology, paleontology, geo-physics, medicine, aging and evolution as ...
    (talk.origins)
  • Pt. 6 - Genesis and Scientific Evidence
    ... Stromatolites (formed by activity of bacteria) on early rocks... ... The advent of photosynthesis and the capacity of biofilms to ... major implications for where photosynthesis happens and where life may ...
    (talk.origins)
  • Re: Pt. 9 Louis Agassiz - Darwins Contemporary
    ... carried out by non-photosynthetic bacteria may still have been ... The advent of photosynthesis and the capacity of biofilms to ... Pacific Ocean. ... organisms, stagnating, doesn't feed the bulldog. ...
    (talk.origins)
  • Re: Pt. 9 Louis Agassiz - Darwins Contemporary
    ... bacteria do not fossilize well. ... major implications for where photosynthesis happens and where life may ... Ocean. ... ....is how scientists typically talk, ...
    (talk.origins)