Several hundred million years ago, when animals communicated by using sound.Several hundred million years ago, when animals communicated by using sound.Several hundred million years ago, when animals communicated by using sound.Several hundred million years ago, when animals communicated by using sound.
One hundred and fifty million years.
5 million years
three hundred thousand years
a million or more years
Millions of million years, Billions of years, (Aeon).
It is highly unlikely. A million years is a short time on a geologic timescale. Earth will remain habitable for a few hundred million years into the future.
Shale can rainge in age from sevel million to several hundred million years old.
.3 is the same as three tenths. Three tenths of one million is three hundred thousand years.
Depending on the original mass anything from a million to a few hundred million years.
one hundred million billion years
1,000,000 hours (one million hours), which is 41,666 days (forty-one thousand six hundred and sixty six days), which is 114 years (one hundred and fourteen years).