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By: Chinami Michaels | Published: Dec 16, 2013

Illustration of the animal-vegetal gradient in Xenopus laevis ( African clawed frog) eggs after fertilization.

By: Anna Guerrero | Published: Feb 06, 2017

The Southern Gastric Brooding Frog (Rheobotrahcus silus) was a frog species that lived in Australia. It was declared extinct in 2002.

By: Amy Pribadi | Published: Oct 12, 2016

This diagram shows the life cycle of Neurospora crassa, a mold that grows on bread. N.