5.02 Journal - 5.02 Evolution Unit Journal Journal Transition Groups describe the features of Therapsids that suggest this group was transitional to

5.02 Journal - 5.02 Evolution Unit Journal Journal...

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5.02 Evolution Unit Journal Journal: Transition Groups - describe the features of Therapsids that suggest this group was transitional to reptiles and mammals Therapsida is a group of synapsids that includes mammals and their immediate evolutionary ancestors. The earliest fossil attributed to Therapsida is believed to be Tetraceratops insignis (Lower Permian).Therapsids evolved from pelycosaurs (specifically sphenacodonts) 275 million years ago. They replaced the pelycosaurs as the dominant land animal. Mammals appeared 200 million years ago, and all therapsids other than mammals became extinct in the Early Cretaceous period (146 Ma to 100 Ma). Therapsids had canine teeth which mammals do, but at the same time had the splayed out legs to the side walk of a lizard. "Therapsid." - New World Encyclopedia . N.p., 27 Nov. 2008. Web. 20 Aug. 2016. Journal: Teaching Evolution - Is there a credible scientific theory that opposes evolution? Not one single piece of evidence has ever come anywhere near close to proving it wrong or indicating any viable alternative in the years since Origin of Species was first published. There are however debates within

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