Average time on market: 41 days Certified Pre-Owned: No Transmission: Automatic Color: Onyx Black Description: Used 2012 GMC Yukon XL 1500 SLT 4WD for sale - $16,900, 118,236 miles with Bluetooth, Leather Seats, Backup Camera, Aluminum Wheels, Navigation System.
How long ago did the first living forms appear on earth? the earliest known life form were single celled organisms which roamed the earth they appeared around two billion years ago Answer: The Earth formed about 4.5 billion years â¦ ago. 700 million years later (3.8 to 3.5 billion years age) life started.5 people found this useful.he earliest known life form were single celled organisms which roamed the earth they appeared around two billion years ago Answer: The Earth formed about 4.5 billion years â¦ ago. 700 million years later (3.8 to 3.5 billion years age) life started. 5 people found this useful.
So there we have it - the first animal on earth was a marine organism. It was not until 240 million years later that the first animal showed up on land. This was a four-legged amphibian called Ichthyostega, which is a Greek term meaning fish roof.