List two ways in which heterogeneous mixtures differ from elements.

Heterogeneous mixtures differ from elements in two ways. First, elements are not a mixture at all; they are pure substances. Heterogeneous mixtures are not pure. The other way is that a heterogeneous mixture can be separated by physical means; elements can't be separated at all; if the elements are separated, it will change their composition. Hope this helps

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i