Question

question 5 (2.5 points)
horseshoe crabs have lived in the earths oceans for_____years.
about 4 thousand
close to 400 thousand
less than 40 million
over 400 million
over 4 billion

Explanation:

Horseshoe crabs are ancient creatures. Fossil records show they have existed for a very long time. 4 thousand years is too short. 400 thousand years is also not in line with their long - standing existence. 40 million years is still much less than their actual fossil - based timeline. 4 billion years is longer than the Earth's life suitable for complex life forms like horseshoe crabs. Horseshoe crab fossils date back over 400 million years.

Answer:

over 400 million