If two fossils are found in the same rock layer, what does that say about the age of the fossils?

It means that they are relatively the same age.

Explanation:

Rocks are layered, so different rock layers = different times. If two fossils are in the same rock layer, then they must equal the same time or around the same time.

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above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.