Download 15-3 Darwin Presents His Case

15-3 Darwin
Presents His Case
Reading: 378-386
Homework Sheet: 15-3
Charles Darwin
 A British naturalist who
traveled around the
world for 5 years
studying life on Earth.
 Galapagos Islandsarchipelago off the
coast of South America.
1859 – Published On the Origin of
Species
 His work polarized the
scientific community.
Some considered it
brilliant, while others
thought it was heretical.
Darwins Theory of Natural Selection
1) Overreproduction
2) Variation of offspring
3) Struggle for survival due to
limited resources
4) Those variants best
adapted to the environment
are more likely to survive
and pass on their traits
5) Over time, life on Earth
changes and new species
develop.
Common Ancestor
 All life on Earth goes
back to a common
ancestor. We are all
“cousins”.
Evidence for Evolutionary Theory
 1) Fossil Record
 2) Homologous
structures
 3) comparative
embryology
 4) DNA evidence