Answer:
D
Explanation:
D is the answer because the other ones are based on opinions.
B) Nucleus!
Prokaryotic cells do not have a nucleus, and the Nucleus in a Eukaryotic cell are large and very hard to miss (if that matters to you!)
Just a few hours after the birth of a baby, the mammary glands start producing milk.
Prolactin is the hormone that stimulates this event!
The X can possibly be the sex chromosome. Like for human female we have the XX chromosomes and when the allele is on the X chromosome we write as X with a R as the superscript on top right.
