A) The data to support his hypothesis, so he should investigate if the same change happens in the density of solid water.
The two main types are DNA and RNA
D surface tension because, adhesion is sticking, b makes no sense for this question, and heat has nothing to do with it either, because it distributes it's weight throughout its legs so it doesn't sink (it doesn't weigh much so this works.)
Hope this helps don't forget to hit that heart :)
The eye doctor is the most recent developments in using lasers for surgical eye procedure
