agenesis

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Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

cloning. First cloned cat. First cloned companion animal. CC (copy cat) female domestic shorthair cat (b. Dec. 22, 2001) photo Jan. 18, 2002. Cloned at Texas A&M Univ. College of Vet. Med. & Biomedical Sciences. Reproductive cloning genetics DNA cc cat

CC, The First Cloned Cat

United States electoral college map showing number of electoral votes by state.

How Does the Electoral College Work?

Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.

5 Remarkably Close U.S. Presidential Elections

The Cheshire Cat is a fictional cat from Lewis Carroll's Alice's Adventures in Wonderland. (Alice in Wonderland)

11 Banned Books Through Time

Close-up of tobacco plants in Ontario, Canada. Tobacco, Nicotiana, cured leaves used after processing in various ways for smoking, snuffing, chewing, and extracting of nicotine.

7 of the World’s Deadliest Plants

agenesis: Related Content

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Topics

atresia and stenosis amelia Potter’s syndrome cyclopia anophthalmia anencephaly meromelia phocomelia hydranencephaly congenital disorder neural tube defect fetal alcohol syndrome Zellweger syndrome hereditary spherocytosis monster cephalic disorder cleft palate congenital adrenal hyperplasia inborn error of metabolism pseudohermaphroditism

Quiz

full human skeleton

Diseases, Disorders, and More: A Medical Quiz

A Yorkshire terrier dressed up as a veterinarian or doctor on a white background. (dogs)

A Visit with the Word Doctor: Medical Vocabulary Quiz

44 Questions from Britannica’s Most Popular Health and Medicine Quizzes