Prokaryotic cells do not have membrane bound organelles
The SI unit that is appropriate for measuring the height of a person is B) meters.
You can also measure the height of a person in feet, however, that is only used in America, and it is not SI unit.
Grams are used for weight, and no person is one kilometer tall, that is a very large distance.
MRNA is needed to make amino acids and proteins. Without this, the liver would not have proteins to carry out tasks and would stop functioning.
D.
Think back to punnet squares. If the parents were of the same genotype then the offspring would be identical in both gene and phenotype. If One of the parents was a Yy, then they'd be phenotypically the same, but have different genotypes.