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Making sense of how life fits together - Bobbi Seleski


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TEDEd Animation

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From something as miniscule as a cell to the biosphere we all call home, living things fit together in numerous interesting ways. Bobbi Seleski catalogs biology from our body and beyond, tracking how unicellular organisms, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and our biosphere build off of each other and work together.

Additional Resources for you to Explore

Bobbi Seleski is a 7th grade life science teacher at the Hastings Middle School in Hastings, MN.
Biological organization can be broken down even smaller. It can sometimes be broken down to six smaller categories! Use this resource to discover the levels which would come before cells. Why can it be argued that they should not be included in “The pyramid of life?”
What is the distinguishing factor which discerns whether something is living or nonliving? One characteristic scientists agree upon is that it has to be made up of cells. Cells are living, but they are made up of molecules and atoms which are not living. So at what point does a group of molecules turn into a living cell?
Biological organization deals with grouping life by levels from simple to complex which also works out to be small to large. What is the size difference between the smallest level and the largest level? Use this website to find the size of an average human cell as compared to the size of the Earth. Although they have a large size difference, they have several similarities. In what ways is an animal cell like the Earth?

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Meet The Creators

  • Director Alan Foreman
  • Educator Bobbi Seleski
  • Narrator Bobbi Seleski

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