Download 1.1 outline- filled in

1.1 LOT Outline
I. Fossils provide evidence of Earlier life
a.
Fossils are remains (imprints) of organisms preseverd in Earth
b.
3 types of fossils: Mineral replacement, bone and imprints
c.
relative dating: Compares ages of two different fossils
d.
absolute age: tell when formed by studying radioactivity in soil
e.
combining relative and absolute age determines when a fossil was formed
II More complex organisms developed over time
a. Unicellular organisms are made of one cell
b. 3.8 Billion years ago unicellular organisms inhabited the OCEAN
c. As oxygen levels changed, so did life on Earth
d. 1.2 billion years ago, mulicellular organisms began to live in the Ocean
e. Cells became specialized- perform a specific job
f. Species moved from land to water
III
Earth’s history includes mass extinctions
a.
mass extinctions- when huge numbers of species have died or become extinct
b.
Permian extinction- 90% of ocean species became extinct due to the changing
Earth climate
c.
cretaceous extinction- dinosaur extinction from a meteorite
d.
extinction of one species leads to another forming EX: dinosaurs to mammals