The uterine lining of the female's uterine cycle is shed during the menstrual phase. Menstrual cycle is a reoccurring cycle which begins at menarche and ends at menopause. During menstrual cycle, the endometrial lining prepares for pregnancy.
Answer:
I know this is late, but for the people looking for the answer, its carbon and hydrogen
Natural selection can only occur because of a variety in a population. Natural selection refers to environmental factors that affect a population and causes some of the population to have more surviving offspring than others. An example is a giraffe with a longer neck will be more likely to survive and reproduce (as it can gather more food from taller trees)
(If you didn't know already )homosexuality is a very touchy subject to talk about for some people.
( )=these just mean that you could use it in the sentence
there you go...i hope its good