Keep my session open?
Ending In 
The session is expired
Your session has expired. For your security, we have logged you out.
Would you like to log in again?

Unit: History of Life

Aligned to Science TEKS with clear Learning Outcomes, this unit covers instructional content including Hypothesis on Origins of Life, Dating Fossils, Geologic Time Scale, and Endosymbiotic Theory.


  • 7A  Analyze and evaluate how evidence of common ancestry among groups is provided by the fossil record, biogeography, and homologies, including anatomical, molecular, and developmental
  • 7B  Analyze and evaluate scientific explanations concerning any data of sudden appearance, stasis, and sequential nature of groups in the fossil record
  • 7G  Analyze and evaluate scientific explanations concerning the complexity of the cell
  • 9D  Analyze and evaluate the evidence regarding formation of simple organic molecules and their organization into long complex molecules having information such as the DNA molecule for selfreplicating life