What are mutations?

a. changes in nucleotides of a dna molecule that affects the genetic message

b. repairs of damage to dna molecules by specialized enzymes

c. removal of damaged dna nucleotides by enzyme molecules

d. reduction in the rate of replication of dna due to regulatory mechanisms.

High blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can to lower blood pressure.which would most likely occur in the kidney? a)more water would be transferred from the nephron.b)less water would be absorbed into the nephron.c)the amount of water in the bladder would decrease.d)the amount of water in the blood would increase.