Text: Ninth grade, freshman year, or grade 9 is the ninth post-kindergarten year of school education in some school systems. Ninth grade is often the first school year of high school in the United States, or the last year of middle/junior high school. Students are usually 14--15 years old. In the United States, it is often called Freshman year. In England and Wales, the equivalent educational year is Year Ten. In Scotland the equivalent educational year is Third Year or S3, as this is the third year of compulsory secondary schooling.

Question: can you be 15 in the 9th grade?

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Answer: yes

Text: Marcus James Jordan (born December 24, 1990) is an American former college basketball player who played for the UCF Knights men's basketball team of Conference USA. He is the son of Hall of Fame basketball superstar Michael Jordan.

Question: does michael jordan's son still play basketball?

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Answer: no

Text: Although osteocytes have reduced synthetic activity and (like osteoblasts) are not capable of mitotic division, they are actively involved in the routine turnover of bony matrix, through various mechanosensory mechanisms. They destroy bone through a rapid, transient (relative to osteoclasts) mechanism called osteocytic osteolysis. Hydroxyapatite, calcium carbonate and calcium phosphate is deposited around the cell.

Question: calcium carbonate and calcium phosphate are deposited around the cell?

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Answer: yes

Text: Estrogens are synthesized in all vertebrates as well as some insects. Their presence in both vertebrates and insects suggests that estrogenic sex hormones have an ancient evolutionary history. The three major naturally occurring forms of estrogen in females are estrone (E1), estradiol (E2), and estriol (E3). Another type of estrogen called estetrol (E4) is produced only during pregnancy. Quantitatively, estrogens circulate at lower levels than androgens in both men and women. While estrogen levels are significantly lower in males compared to females, estrogens nevertheless also have important physiological roles in males.

Question: is there such a thing as natural estrogen?

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Answer:
yes