Answer:
Girls have menstrual cycles because girls have changes of hormones in their body. The hormones make the lining of the uterus build up. This gets the uterus ready for an egg which when the egg is released it causes a period also known as a menstrual cycle which happens normally every month for at least 3-7 days.
Explanation:
Answer:
true
Explanation:
because they gained heat and change it's from to liquid and then gas
Answer:
What do I need to do if my heart rate is below my target range during a cardio activity? What does it mean if it is too high?
Explanation:
it mean that your heart rate is going slow and that your not moving that much and that your not that active.
when your heart rate is up means that your working hard as in running doing something active.
D Trust me I just learned this yesterday in science
