Can someone please give me the answer i don't know which one it is?

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm

This diagram shows how seed plants are grouped. which is the missing label? bryophytes angiosperms pteridophytes monocots

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury