Liquid water has a constant density. Do you agree or disagree with this statement? Why or why not?

I agree, because Water has a heavier density than ice, which causes ice to float. If you look at the atomic structure of water, you can see the atom's are packing closely together, and everything has density.

Liquid, do not have a constant density, and does. This is because densi itself is not constant however, when it comes to liquids they only expand slightly with pressure and temperature but should be constant most of the times.

b is the best answer for this question.

the answer will be a) proteins i believe