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…into numerous ecological niches?
Under times of extreme ecological distress such as this, how far would, say, five million years of evolution get you? How much diversification.
This is research for a novel. Thanks!

I think not. Mammals and dinosaurs appeared the same time ( late Triassic). And where both pretty small. Go to the Cretaceous and dinosaurs had came in many DIFFERNT sizes varieties and basically filled every ecology niche. The mammals where still unchanged. All of them where about the size of a mouse and only ate insects. After the dinosaur wen t extinct that when we say mammals become DIFFERNT vartites and started to change size. I think if the dinosaurs never went extinct they would still be the apex organism.
Dinosaurs and ancie t reptiles filled every ecological niche mammals do now. (pilosaurs for dolphins and whales) ( raptors for wolfs and lions) ( small tree dwelling dinosaurs for squirrels and rodents) etc erc Not to mention no mammals has really reached the size of any dinosaurs. Short face bear the largest mammalian predator that ever existed was tiny compared to the 60 foot long spinosaurs. Basically what I’m trying to say if dinosaurs never gone extinct us humans and many other mammals would not had even evolved. And we still be the same size of a mouse.

I think not. Mammals and dinosaurs appeared the same time ( late Triassic). And where both pretty small. Go to the Cretaceous and dinosaurs had came in many DIFFERNT sizes varieties and basically filled every ecology niche. The mammals where still unchanged. All of them where about the size of a mouse and only ate insects. After the dinosaur wen t extinct that when we say mammals become DIFFERNT vartites and started to change size. I think if the dinosaurs never went extinct they would still be the apex organism.
Dinosaurs and ancie t reptiles filled every ecological niche mammals do now. (pilosaurs for dolphins and whales) ( raptors for wolfs and lions) ( small tree dwelling dinosaurs for squirrels and rodents) etc erc Not to mention no mammals has really reached the size of any dinosaurs. Short face bear the largest mammalian predator that ever existed was tiny compared to the 60 foot long spinosaurs. Basically what I’m trying to say if dinosaurs never gone extinct us humans and many other mammals would not had even evolved. And we still be the same size of a mouse.

Which group of animals evolved to fill the niches left following the extinction of the dinosaurs?
Answer
a.
birds
b.
mammals
c.
fish
d.
amphibians

During the great american interchange, mammals from north america spread southwards and adapted well, yet only three south american mammals managed to successfully invade in north america to the present day: the porcupine, opossum and armadillo.
Why were these three so successful? what adaptations might they have had that the others didnt? how were they able to find a niche?

also…
b.) What was the critical evolutionary event which led to the tremendous diversity of grazing animals?
c.) What can be said regarding the spread of mammals into various niches of life [air, fresh water, oceans, land]?