Centipedes appeared around 420 million years ago, they are one of the first terrestrial animals.
about 420 million years ago
420 million can be written as 420,000,000 in digits.
Your answer is only about the name, so no. The mountain is 420 million years old
420 million years ago
thay were around when there were dinosrs
100 years = 1 century so 420 years = 4.2 centuries.
$420 million
4 420 000
$420 million
Bony fish first appeared on Earth around 420 million years ago during the Silurian period. They evolved from earlier jawless fish and quickly diversified into various forms, becoming one of the most successful groups of vertebrates in the oceans.
Sharks have existed longer than dragonflies. The oldest dragonfly fossil is believed to be 320 million years old, where the first shark fossil is 420 million, a full 100 million year difference.