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How old was the earth when the first mammals appeared how long ago was this?
Wiki User
∙ 14y ago
The first true mammals appeared in the early Jurassic, about 200-180 million years ago. The Earth is approximately 4.54 million years old today, so it would have been about 4.34-4.36 billion years old at that point.
Wiki User
∙ 14y ago
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When did the first mammals walk the earth?
A very long time ago.
How long have mammals flourished on earth?
500,000
Would a dinosaur beat a cat in a battle?
Yes, in a science fiction film. Dinosaurs died out long before mammals appeared on the Earth.
Did sharks appear when dinosaur extinct?
No. Sharks appeared on earth long before the first dinosaurs did.
Which are older mammals or birds?
Mammals are older. The first mammals evolved around 220 million years ago, not long after the first dinosaurs. Birds evolved from small carnivorous dinosaurs about 160 million years ago.
Why are you in the primordial ooze?
Humans didn't emerge from the primordial ooze, but evolved from mammals that were already a very long distance from the primordial ooze. Sexuality had evolved even long before the first mammals appeared. You are confused. Hermaphrodites don't reproduce asexually. In any case, sexual reproduction confers considerable evolutionary advantages.
When did crime start falling across the country?
It became like this from a long, long time ago. It started when humans first appeared on Earth. Like about millions of years ago.
When did the first mammals appear on earth?
Tertiary Period, Cenozoic ^^^LOL, wrong they probably appeared about the same time as the dinosours: 250 million years ago Umm.... first answer was right... Thanks a lot to NathanChooper for screwin that up Ummm your alll long cause i made them appear when i wanted :) and ...nvm ok, mayby they appeared during the early jurassic (200mya) but it was long before the cenozoic. nathanchooper:1 some guy i'm arguing with: 0
Fish appeared on Earth about how long ago?
2years ago :)
How long have dachshunds been on earth?
Shorthaired and Longhaired Dachshunds had appeared in Europe since the 15th century, and Wirehaired Dachshunds were first bred in 1790.
What came first a bee or a horse?
The bee came first, insects were around long before mammals or even dinosaurs.
Earth's first vertebrates appeared during this period?
No, the first vertebrates evolved long before the Mesozoic. The first vertebrates, small jawless fish, evolved around 520 million years ago. Land animals had even evolved long before the Mesozoic Era.
