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Title: What are some of the milestones on the phylogenetic tree? Post by: firepain on Oct 6, 2012 This doesn't need to be too long of an answer. Just a couple of sentences will suffice. Thank you
Title: What are some of the milestones on the phylogenetic tree? Post by: rlalonie28 on Oct 6, 2012 If you look at the evolutionary tree in detail, you will see that there are no milestones. The transitions are smooth.
However, here are a few important events: The emergence of the first self-synthesizing chemical compound (probably RNA) The emergence of the first cell Photosynthesis Development of bacteria that could use the otherwise toxic oxygen from photosynthesis Development of sexual reproduction Development of multicellular organisms Title: What are some of the milestones on the phylogenetic tree? Post by: Leugim Legna on Oct 6, 2012 I usually refer to 5: photoautrophy, which allowed life to leave the sea; the amniotic egg that allowed animals to have a terrestrial habitat; homeothermy, which allowed animals to inhabit colder climates; placental/marsupial mammals that kept their young with them for longer times; and plant vascular tissue so that plants could grow taller. Evolution of flowers is important, too.
Of course, this is just an opinion. |