sex hormone

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Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

6 Animals We Ate Into Extinction

Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant

7 of the World’s Deadliest Plants

Aspirin pills.

7 Drugs that Changed the World

Gutzon Borglum. Presidents. Sculpture. National park. George Washington. Thomas Jefferson. Theodore Roosevelt. Abraham Lincoln. Mount Rushmore National Memorial, South Dakota.

9 Memorials and Monuments in the United States

US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.

Timeline of the 2000s

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

sex hormone: Related Content

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Topics

estrogen androgen relaxin 17-ketosteroid progestin levonorgestrel testosterone progesterone diethylstilbestrol norethandrolone sex chromosome melatonin sexual differentiation parathyroid hormone pheromone neurohormone sexual dimorphism unisexuality urogenital system bisexuality

Dig Deeper: More Articles That Discuss This Topic

hormone: Hormones of the reproductive system

Key People

Butenandt, Adolf

Adolf Butenandt

German biochemist

Frank Rattray Lillie

American zoologist

Edward Adelbert Doisy

American biochemist

Quiz

Male muscle, man flexing arm, bicep curl.

Facts You Should Know: The Human Body Quiz

Muscles of facial expression, human anatomy, (Netter replacement project - SSC). Human face, human head.

Characteristics of the Human Body