4 Written questions
4 Multiple choice questions
- Free nitrogen can not be used so it has to become fixed. Bacteria perfoms this function.
- Occurs where no previous ecosystem existed. First species to appear are lichens and mosses.
- First life was unicellular, did not need oxygen, were consumers, and lived in oceans. Formed by chemical units.
- Occurs after a disturbance in an already existing ecosystem. First species to appear are weeds/grasses.
3 True/False questions
Predator → Animal that gets eaten.
Scavenger → Animal that gets eaten.
Water Cycle → Driven by the sun. Changes from liquid to gas to liquid again.