Changing the would change it into an atom of a different element.
a. number of electrons surrounding the nucleus of an atom
b. number of protons in the nucleus of an atom
c. electrical charge of an atom
ber of neutrons in the nucleus of an atom

B

Explanation:

Adding or removing protons from the nucleus changes the charge of the nucleus and changes the atom's atomic number.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

the answer is b.) hydrogen bonds between bases.