Answer:
the cycle of night and day
hope this helps :p
Explanation:
<span>After the third month of development, lanugo develops on the head (thin, first hair), the muscles and bones are formed an shaped, the mouth movement is possible, the liver and pancreas produce fluid secretions, meconium is made (stool of infant), reproductive organs are developed, but the baby's gender is difficult to distinguish on ultrasound.</span>
Answer:
I think its D or B. Not sure but its either one
D. Number of protons in an atom's nucleus
