they have lived on earth for about 6000 years
Lobsters have lived on the earth for 250 million years.
they have lived for up to millions of years
We do not know as eels do not leave good fossils. Also your English is a bit wrong your question should be worded "How many extinct eels were there". This is because if they are extinct they would have lived in the past not the present.
heyy
What fossil records tell about seedless plants that lived on earth long ago?
very long
they have lived for billions of years they lived longer than dinosaurs.
about 100million yrs
For hundreds and millions of years
they can be 4ft to 6ft long
2cm long