So humans evolved from fish?

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chesswizard

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I was just thinking about evolution and it occurred to me
that all land animals evolved from walking fish and
if that's so then mammals evolved from fish, unless
some mammals were fish before they came to land but
I thought that everything started out as a fish but
what about crabs. Did they walk onto shore first
or was it fish. And what is the oldest recorded mammal
and did it morph from an amphibian?
And that would then mean that birds evolved from fish too
before they were dinosaurs.
 
probably. i'm not sure about the exact evolutionary lineage, but the important and surprising thing is we ultimately came from prokaryotes (perhaps bacteria). i have a hard time seeing myself as related to an ape let alone a simple single celled organism, but that's what the evidence shows.
 
well, everything is a theory. so nobody can ever be sure. But yes, it is believed by many that everything was evolved from a unicellular organism. not nessessarily a walking fish though. but most likely a water animal who developed an ability to be able to be on land for a short period of time.
 
im not a specialist but..
first there were small prokaryote cells.. then from them, eukaryote cells (with a nucleus) developped. then some began photosynthesizing and released oxygen. that diversified life into an enourmous soup of different cells. from it, the first algae evolved. then plants branched off, then fungi.. and we are left with animals.. they branched into vertebrates and invertebrates (like crabs) and vertebrates developped into fish, and that's the point where you know the rest.
so, we came from acient fish, and we are related to plants! cool, isn't it?
 
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