Which statements are correct concerning human dna?
it contains 23 chromosomes
it contains 46 chromosomes
each strand contains chromosomes from one parent.
each chromosome contains 23 genes,

The answer should be option B and C "It contains 46 chromosomes, Each strand contains chromosomes from one parent." When a baby is made it receives 24 chromosomes from the mother and 24 chromosomes from the father in equal will have 46 chromosomes. It's also true that each strand contains chromosomes from one of the parents.

Hope this helps.

is called echinoderms

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.