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Found my man o war question
Humans have four layers of life and three major evolutionary transitions. Genes to genomes, simple cells to complex cells, complex cells to mutli-celled. The layers are viroids, organelles, cells, and the whole body. Man o wars are a siphonophorea colony of zooids. Zooids are multicellular animals. So does this mean a man o war has five layers of life, and four major evolutionary transitions?
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If reptiles evolved from fish, when would we have started classifying them differently?
the long and short of it is:
there is no hard fast line where one taxon stops and another begins; rather, there are evolutionary transitions. what that means is that the change from fish to tetrapods (the group containing reptiles; reptiles didnt evolve directly from fish themselves) happened very gradually to an extent that there is no species that can be hailed directly as the first tetrapod, which is why when youre reading about evolutionary transitions, they always say one of the first.
its like this gradient:
where does the blue stop? where does the purple start? the answer is that there isnt a clear line that has blue and blue only to its left and purple and purple only to its right.
its similar when talking about the fish to tetrapod transition. theres a reason organisms like tiktaalik and archaeopteryx are called transitionary organisms; they have x and y traits of one group and b and c traits of another.
look; the creature at the bottom is 100% fish and the creature at the top is 100% tetrapod, but in between? theres no immediate shift from fish to tetrapod, and the same goes for the vast majority of transitions.
tl;dr: theres no point at which classification changes from one group to another because evolutionary transitions are gradual and not subtle
