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Receding Waters


Students discuss adaptations of Arizona frogs and toads and participate in a simulation activity to demonstrate how a small receding (ephemeral) pool impacts the life cycle of certain amphibians.

Suggested Grade Levels

K - 7

Time Frame

1 day (30 - 45 minutes each day)

Enduring Understandings

After completing the activities contained in this lesson, the student should understand these basic concepts:

  • Animals are adapted to survive in the environment in which they live.
  • Ecosystems change over time due to natural and human events.
  • All living things have a life cycle that ends with the death of the organism.
  • Population sizes are dependent on a variety of environmental factors such as climate, predation, and species competition.
  • Human activities can affect the potential for hazards .

Arizona Department of Education Standards

This lesson was designed to present an integrated approach to learning. Not only will the students be introduced to science concepts dealing specifically with ecosystems, but they will also develop and interpret graphs and write a persuasive paragraph. Although the lesson plan includes the specific performance objectives, the following general concepts are covered:

    Grade Level
Subject Strand K 1 2 3 4 5 6 7
Science 1   x x x x x x x
3         x x    
4 x x x x     x x

Download This Unit

This lesson is available in a standard PDF form:


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