Study Guides (390,000)
CA (150,000)
UOttawa (10,000)
BIO (1,000)
BIO 1130 (300)
Final

Hadean and Archean Eons.doc


Department
Biology
Course Code
BIO 1130
Professor
Jon Houseman
Study Guide
Final

This preview shows half of the first page. to view the full 3 pages of the document.
Hadean and Archean Eons
Slide 1-5:
-the solar system forms by accretion or attraction of small particles being pulled in which
collapses at the centre and creates kinetic heat, forming the sun
Hadean Eon
-4 800 - 3 800 Ma
-formation of the solar system and planets
-ends with the origin of life
-creation of planets with conditions ripe for life to evolve; sets the stage for life
Archean Eon
- 3 800 Ma - 2 500 Ma
-anaerobic bacterial life; first bacterial forms
-no oxygen at first but bacteria captures energy by splitting water molecules and gives
oxygen as a by-product
-oxygen then accumulates
-oxygen causes minerals to oxidize (rust)
Proterozoic Eon
-2 500 - 543 Ma
-oxygen atmosphere
-first single celled aerobic organisms form
-more complex cells
-develop eukaryote architecture
-most single celled organisms that represent the prokaryotes and eukaryotes
Phanerozoic Eon
- 543 Ma -present
-in a very short period of time, multicellular life appears
-can be divided into the paleozoic eon (543-251 Ma), mesozoic eon (251-65 Ma), and
Cenozoic eon (65 Ma to present)
meso = middle
paleo=old
paleozoic- all organisms are in the oceans; eon ends when organisms move up on
land
mesozoic- plants go through major change (i.e.: flowers); they are fertilized with
pollen instead of spores
-dinosaurs become successful
cenozoic- cataclysmic event causes dinosaurs disappear; mammals / birds thrive
You're Reading a Preview

Unlock to view full version