The fossil shown in this photo is of a Basilosaurus. Its skeletal features suggest that it spent its entire life swimming in the ocean. Look at the environment the fossil was found in. Consider that Basilosaurus lived in the ocean. How has the environment of this location changed since Basilosaurus lived?

The environment changed drastically probably due to tectonic plates shifting and either causing this part of land to move to a higher altitude or blocking the water from being in this now deserted place. At some point it seemed to be a river shown in the picture of the rock on the top right corner, as the rock looks a bit corroded it seems that the ocean slowly disappeared.

Explanation:

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this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.