ORIGIN OF LIFE NOTES
NAME ___________________HR____
MAIN IDEA
Life arose from _________________ matter through natural ______________ processes on early Earth.
EARLY EARTH & FORMATION
IDENTIFY: When did the Earth form? ________________
LIST: The environment on early Earth was:
1.
__________
2. __________________
3.__________________
LIST: The atmosphere was primarily composed of gases like:
1.
_________________
3. _____________________
2.
_________________
4. ____________________
FORMATION OF OCEANS
-Water vapor _________________ as Earth cooled.
- ____________ filled basins and low-lying areas, forming oceans.
-Comets and ________________ may have delivered additional _______________.
-Oceans provided a ____________ environment for life to _______________.
THEORIES OF LIFE’S ORIGINS
PRIMORDIAL SOUP THEORY
PANSPERMIA
HYDROTHERMAL VENT THEORY
CHANGE IN O2 CONCENTRATION
-Scientists believe that Earth’s early atmosphere contained a range of common gasses,
but it took over a _________________ years for ______________ levels to rise to
what they are today.
-It is believed that _____________________ arose first and was followed by aerobic
__________________________________
ENDOSYMBIOTIC THEORY
-Early prokaryotic cells ________________ other cells.
-Engulfed cells ______________ and became _____________________.
- _____________________ and _____________________ evolved this way.