system
Given the following post, respond as if you're commenting on Reddit:
human
[Jurassic World] If DNA is obtained from mosquitoes in amber, where did the DNA of an aquatic animal like Mosasaurus come from?

I mean, sure, there's a chance that a mosquito could have landed on a mosasaur and drained its blood while it was out of water, but that seems really unlikely. However, I've heard DNA can also be obtained from fossils. Is that true, and is that how Jurassic World got enough DNA to clone one?
gpt
In the original book, amber was just one of the ways they got DNA.  They also could sometimes get it out of fossilized bone marrow.

I would also guess JW has a lot of money in finding DNA.  Amber mines, bones, and frozen or preserved specimens.