✅ Answers
Answerer 1
3.5 billion year old fossils of bacteria that lived before there was oxygen on Earth. Those things still live today in anaerobic environments.
Source(s):
http://www.sciencedaily.com/releases/201…
Answerer 2
rocks I think in Australia, maybe else where
bacteria layers calledstromatolitess” ( I think)
reliably dated at over 1 billion = 1,0 years old, maybe more
watch a Nova TV about 4 billion years of Australiann geology and biology. a National geographic series
Really fascinating and well documented
what kind of fossil? sea life goes back 5 million years
Source(s):
general knowledge watch science shows
Answerer 3
There are some bacteria from somewhere in Greenland or somewhere like that which are about a million or so years old.