What happens to water when it changes to ice?
its density increases.
its density decreases.
its mass increases.
its mass decreases.
its volume increases.
its volume decreases.

Its density decreases, and its volume increases

Explanation:

Density is defined as Mass/Volume. What happens when water transforms into ice is that its density decreases because the volume the molecules now occupy increases.

The denominator of the rational expression is now larger (while the numerator stays the same), so the quotient gives a smaller number.

answer: electrons

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).