Why is it important that solid water, ice, floats rather than sinks?

it floats

Explanation:

The reason why it floats is because of the density of the ice cube

Explanation:

because if it were to sink, then it would slowly cause the entire body of water to turn into ice. this would cause all the marine life to die out because the water is frozen (unless the organisms can survive in freezing temperatures).

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products