Iron is in your blood
vitimin c is good for your skin
that is 2 of them
Answer:
via hydrogen bonds; there are two between adenine and thymine and three between cytosine and guanine
D. controlled cell suicide
The four phases of the menstrual cycle are menstruation, the follicular phase, ovulation, and the luteal phase. Common menstrual problems include heavy or painful periods and premenstrual syndrome (PMS). Knowing when in the menstrual cycle a woman is most likely to conceive can increase the chance of pregnancy.