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Estrogen (British English: oestrogen; see spelling differences) is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. [ 1 ][ 2 ] There are three major endogenous estrogens that have estrogenic hormonal activity: estrone (E1), estradiol (E2), and estriol ...
Buchanan suffered from esotropia. In addition, one eye was short-sighted and the other far-sighted. To cover this, he bent his head forward and leaned it to one side during social interactions. [142] This led to ridicule, which Henry Clay, among others, used ruthlessly during a congressional debate. [143]
Estonia is a developed country with a high-income advanced economy, ranking 31st in the Human Development Index. [24] The sovereign state of Estonia is a democratic unitary parliamentary republic, administratively subdivided into 15 maakond (counties).
The presidency of William Henry Harrison, who died 31 days after taking office in 1841, was the shortest in American history. [ 6 ] Franklin D. Roosevelt served the longest, over twelve years, before dying early in his fourth term in 1945. He is the only U.S. president to have served more than two terms. [ 7 ]
The apostrophe (' or ’) is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet and some other alphabets. In English, the apostrophe is used for three basic purposes: The marking of the omission of one or more letters, e.g. the contraction of "do not" to "don't".
Serbia is an upper-middle income economy and provides universal health care and free primary and secondary education to its citizens. It is a unitary parliamentary constitutional republic, member of the UN, CoE, OSCE, PfP, BSEC, CEFTA, and is acceding to the WTO.
Russia,[b]or the Russian Federation,[c]is a country spanning Eastern Europeand North Asia. It is the largest country in the world by area, extending across eleven time zonesand sharing land borders with fourteen countries. [d]It is the world's ninth-most populous countryand Europe's most populous country. Russia is a highly urbanised country ...
t. e. The number π (/ paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.