Comment on Evolution Factsberg

panda_abyss@lemmy.ca ⁨2⁩ ⁨weeks⁩ ago

• crazycraw@crazypeople.online ⁨2⁩ ⁨weeks⁩ ago

  Yeahhh, I looked it up and I don’t know what OP meant. there are redwood lichen who live symbiotically with the trees but are separate life forms.

  Then there’s the “redwoods of the sea” huge kelp like algae structures that resemble tree growth patterns but… like aren’t the actual redwood trees.

  soooo yeah. I dunno.

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  • crazycraw@crazypeople.online ⁨2⁩ ⁨weeks⁩ ago

    [deleted]

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    • Catoblepas@lemmy.blahaj.zone ⁨2⁩ ⁨weeks⁩ ago

      Every tetrapod evolved from fish, including humans and pterosaurs.

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      • crazycraw@crazypeople.online ⁨2⁩ ⁨weeks⁩ ago

        ok well yeah I don’t disagree all terapoda evolved from ancestors we call fish but then… they and we were also single cell life forms? OP is trying to say they ‘are fish’ and that’s just a random pull from history instead of direct lineage.

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    • Entropy_Pyre@lemmy.ca ⁨2⁩ ⁨weeks⁩ ago

      You’re forgetting our first land ancestor, the fish that decided to come up on land. By certain definitions, all land animals that descended from that ancestor are fish.

      It’s an obscure biology joke. Doesn’t play into day-to-day conversations. It is the same logic that causes biologists to say that birds are dinosaurs though—because they descended from dinosaurs. But by the same logic, birds also evolved from lizards, and before that amphibians, and from before that fish, etc. This definition is more like putting all of life into nested boxes. Or perhaps it’s more like the saying “all tigers are felines, but not all felines are tigers”.

      This definition is helpful for evolutionary biologists to talk about evolution at grand scale and how we might share certain genes with fish. But it’s admittedly not very helpful for day-to-day conversations that say humans are pretty distant from fish and don’t resemble them much at all now. (Though I admittedly love little biology facts like how our middle ear bones evolved from gills.)

      Anyway. I get silly excited about this stuff. Random nerdy rant done.

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      • Auli@lemmy.ca ⁨2⁩ ⁨weeks⁩ ago

        Dinosaurs are not lizards.

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• gandalf_der_12te@feddit.org ⁨2⁩ ⁨weeks⁩ ago

  it depends on how you define algae. different authors use different conventions.

  sometimes: algae = the set of all organisms that live in water and do photosynthesis

  sometimes: algae = the set of all cyanobacteria

  these are not the same groups.

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