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The Calymmian Period (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning "cover") is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Mya to 1400 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.
The Fairbanks House in Dedham, Massachusetts, the oldest still-standing timber structure in North America, was built in c. 1637. First Period is an American architecture style originating between approximately 1626 and 1725, used primarily by British colonists during the settlement of the British colonies of North America, particularly in Massachusetts and Virginia.
First eurypterids and ostracoderm fish appear, the latter probably giving rise to the jawed fish at the end of the period. First uncontroversial terrestrial fungi and fully terrestrialised plants . Ice age at the end of this period, as well as a series of mass extinction events , killing off some cephalopods and many brachiopods, bryozoans ...
Girls have started getting their first period earlier than in the past, so now it's considered "normal" for girls to get their period between 9 and 14 years old, says Maureen Whelihan, M.D., an ob ...
The findings, published May 29 in JAMA Network Open, indicate the average age at menarche — an individual’s first period — decreased from 12.5 years for those born 1950–1969 to 11.9 years ...
Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
Menarche (/ m ə ˈ n ɑːr k i / mə-NAR-kee; from Ancient Greek μήν (mēn) ' month ' and ἀρχή (arkhē) ' beginning ') is the first menstrual cycle, or first menstrual bleeding, in female humans. From both social and medical perspectives, it is often considered the central event of female puberty, as it signals the possibility of ...
Knowing the first day of a woman’s last menstrual period is useful in other ways. Dr. Arlene Go, an ob-gyn and specialist fellow studying endometriosis at Hera Biotech, tells Yahoo Life that it ...
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