| A | B |
|---|
| abiogenesis | The formation of life from non-living molecules |
| event that brought a lot of water to earth | meteor and asteroid collisions |
| organic molecule that naturally forms water loving and water hating membranes | lipid |
| from one common ancestor | all of life is said to have evolved this way |
| simple, single-celled organisms | first organisms to evolve |
| 3.8 billion years ago | when life first appeared |
| multi-cellular organisms | what the first single-celled organisms evolved into |
| Conditions on primitive earth | water, nitrogen, hydrogen, and ammonia |
| ammonia | NH3 |
| first single celled life forms | scientists say all life descended from these |
| the first organisms | anaerobic and heterotrophic |
| anaerobic bacteria release | carbon dioxide |
| phospholipid | a type "organic molecule" - lipid that does have a water loving head and a water hating tail |
