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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.

Chimpanzees!

I just need these two questions that I can’t find anywhere.
DOWN
1. Principle proposed by Darwin that suggests that ALL species- living and extinct- were derived from a common ancestor (2 words)
5. Principle proposed by Darwin that suggests that species look different than their ancestors as they adapt to live in different habitats and establish different niches (3 words)

Species. Let me explain.
For example, the Guam Rail is extinct in the wild because of the Brown Tree Snake. Meanwhile, the Hawaiian, Laysan and Wake Island Rails are all extinct, for different reasons. Could introducing the Guam Rail to one of these islands work? The Wake Island rail was extirminated by hungry soldiers in WWII, and the Laysan Rail was victim of habitat destruction by rabbits, but the rabbits have been exterminated, so the Guam Rail would not be threatened by those.
So, the Guam Rail ‘could’ be helped by filling an ecological niche, thereby probably helping (or at least not hurting) the island it’s introduced to. Of course, whether or not it survives is still a question, but research beforehand would probably fix/help that.
But, yeah- has there been any thought of helping an endangered species by having it ‘replace’ a similar extinct species to increase it’s numbers?

imagine tomorrow every land animal except chickens went extinct, then you come back and look at the earth in say 100,000,000 years time, will the chickens have filled all ecological niches left by the other animals by then?