Question

According to fossil findings, mammals first appeared on earth approximately how long ago?
[a] 50 million years
[b] 65 million years
[c] 1 billion years
[d] 4 billion years

Answer 1

Hi! @vita955
Before i help you out with it, why dont you give it a guess?

Answer 2

Hi! @vita955
Before i help you out with it, why dont you give it a guess?

Answer 3

1 billion

Answer 4

?

Answer 5

No..the first placental mammals were present approximately 65 million years ago..An early mammal fossil discovered in Mongolia led to researchers asserting that the origins of placental mammals, which include humans, can be dated to approximately 65 million years ago.

Answer 6

thank you!

Answer 7

Welcome! Happy OpenStudying!!