How can the two chromosomes that make up a homologous pair differ?

a. they can contain different alleles for the same trait.
b. they can contain genes that code for different traits.
c. they can contain the same genes in different orders.
d. they cannot differ in any way when homologous.

answer; the above statement is (true);

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

a lot of people sadly don't know the best way to learn is cheating off of your friends or this amazing thing called google