Biology 25

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Protist Evolution

Topic (25) Evaluate claims about ecosystem stability vs ecosystem change. (HS-LS2-6)

The first protists originated around 1.7 billion years ago from simple societies of prokaryotic cells. Environmental conditions were significantly different then vs. now. Use this topic to explore, support, or refute the relationship of ecosystem stability and change – and its relationship to life.


2.5 billion – 1 billion years ago. Proterozoic Eon (Through millions of years, blue-green algae produced oxygen that reduced atmospheric methane, a potent greenhouse gas, and this reduced obviously the temperature. In Proterozoic were no plants on land, the continents were barren and naked.


Lesson 1 (or “Day 1”) Material
Virtual Text Book

5:06 Protists

4:11 Protists | Biology

2:58 Protista: The Ancestor Of All Plants And Animals



Instructor Resources

Standard Daily Material
  • Day 1 – Standard material – introduction day
  • Day 2 – Standard material – reading day
  • Day 3 – Standard material – make a presentation
  • Day 4 – Standard material – give a presentation
  • Extra! – Enrichment and remediation options
Other Topic Specific Resources

Special Notes and Notices

Instructor Emphasis:

  • Science & Engineering Practice: Engage in scientific argument from evidence.
  • Cross-Cutting Concept: Stability and Change.

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