Common DescentThe Principle of

Mr. Sapora

EvolutionLearning Target #6

“I think...” What does Darwin’s mechanism for evolution suggest about living and extinct species?

Every organism alive today is descended from parents who

survived and reproduced.

Fossil Record evidence

Deep Time = enough time to explain all life related = enough time to explain all life related

Descent with Modification

Living species are descended, with

modification, from common ancestors.

Tree of Life

Common Descent on the Tree of Life (the animal branch)

Modern Tree of LifeThank you DNA!Thank you DNA!

one in a million

orone out of million...

Where do we fit?

Where do we fit?