Why was movement a useful innovation for cnidarians?

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

What is the molar mass of a gas that has density of 2.054 g/l

Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that