Answer: The Precambrian Era comprises all of geologic time prior to 600 million years ago.
Explanation: The Precambrian was originally defined as the era that existed before the emergence of life in the Cambrian Period. It is known that life on Earth began by the early Archean and that fossilized organisms became more and more abundant throughout Precambrian time.
This is the North Atlantic Ocean.
It can be judged by its surrounding, as it is located near the North Pole, we can deduce that it is an ocean located at the north, which could either be north Atlantic or North Pacific.
We can then use the continential plate to help us determine, which is the North America plate.
Therefore this is the North Atlantic Ocean.
Hope it helps!
