Middle School Life Science

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Middle School: Systems:

This year, we'll think about things in terms of systems, for example: the Earth as a system; the human body as a system; a cell as a system; computers as systems.

Systems interact with each other, but each can be pictured (modeled) as a discrete thing, that has certain things going on inside, but takes in inputs and produces outputs that affect other systems around it.

We'll start by talking about the Earth as a System.


Evolution and Earth History

Earth History



The Human Body as a System

Inputs and Outputs

  • What are the inputs and outputs?
  • Where is the boundary?
    • Is it an open or closed system?
  • How does it interact with other systems?

Internal Systems

  • What happens to the inputs?
  • How are the outputs produced?
  • What are the internal systems that process the inputs and produce outputs?
  • How do the internal systems interact with each other?


  • What things are in equilibrium?
    • What type of equilibrium
    • How is the equilibrium maintained?
  • Are there other internal systems that help regulate the system?

Organ Systems

The glossary of organs in the human body

Reference: Zygote Body: 3d model of the organs in the human body



Outdoor Education

Weather Data

2012 Weather (10/22/2012)

Science Fair Projects

For Reference

The Earth as a System

Inputs and outputs

Internal systems (sub-systems)

To begin to understand what happens within a system we ask the questions:

  • what happens to the inputs when they go in?
  • how are the outputs produced?

Which leads to the question:

  • What are the internal systems?
    • Energy and Matter
  • How do the internal systems interact?

Characteristics of Systems

System Diagram

Draw a diagram showing the Earth System


  • Energy Cycle
  • Water Cycle
  • Geologic Cycle
  • Carbon Cycle
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