Describe how natural selection was evident during the development of early organisms like bacteria and cyanobacteria. Discuss how these relationships led to the formation of eukaryotic cells cells with a well-defined nucleus. Describe how geology has influenced the formation and development of life. Think about geothermal energy, plate tectonics, tides, mountain formation, and atmospheric conditions. Describe several ways the formation and presence of the moon changed life on Earth.
Protozoans are unicellular organisms that have a true nucleus.
They live in fresh water and salt water. Some live independently, whereas others live in colonies. Most protozoans are heterotrophs, whereas others are autotrophs. Have your students research the difference between autotrophs and heterotrophs and then list and draw protozoans that fall in each category. Students should be prepared to give a rationale for placing a particular protozoan in a category.