extrinsic pathway

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United States Presidential Election of 2012. Mitt Romney. Official portrait of President Barack Obama in the Oval Office, Dec. 6, 2012 after his reelection Nov. 6, 2012. Official portrait Obama

10 Democrats Who Made History

Washington, D.C. locator map.

What State Is Washington, D.C. In?

Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)

6 Cultures That Recognize More than Two Genders

Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.

9 of the World’s Deadliest Mammals

United States elections portal page linking to each election interactive

A History of U.S. Presidential Elections in Maps

extrinsic pathway: Media

cytology

Images

apoptosis

apoptosis

Extrinsic and intrinsic factors of apoptosis.

Encyclopædia Britannica, Inc.