Menstruation cycle, also known as women’s period, is the monthly series of changes woman’s body goes through in preparation for pregnancy. It happens in four phases. The first phases is called follicular phase. In this phase the menstrual bleeding comes out and is considered as Day 1 of the cycle. While the bleeding happens, the , the ovaries are simultaneously preparing to ovulate again. Then, after the bleeding stops the uterine lining (also called the endometrium) begins to prepare for the possibility of a pregnancy. It becomes thicker and enriched in blood and nutrients. What happens during the bleeding?

Menstruation cycle, also known as woman’s period, is the monthly series of changes woman’s body goes through in preparation for pregnancy. It happens in four phases. The first phases is called follicu...

A. Secondly, the oxygen in the lung moves through blood vessels to the heart which then pumps the oxygen-rich blood to all parts of the body. B. Last but not least, the carbon dioxide returns to th...

A.It is caused by the winds that blows across. B. A raised line of water that moves across the surface of an area of water, such as sea and lakes, is called wave. C.This transfer of energy cause...

Most sulfur__ factory chimneys as the gaseous sulfur dioxide ( SO 2 ​ ) and most nitrogen __ also __as one of the nitrogen oxides (NO or NO 2 ​ ).

Acid rain ___ from sulfur in coal and oil. When they ___, they ___ sulfur dioxide ( SO 2 ​ ). The best words to fill in the blanks are ….