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Big Ideas

Big Ideas. From Gizmo Activities. Birdbeak Gizmo. Organisms ADAPT to their environment over time; the most fit organisms survive to mate. During normal rainfall, most birds will have average sized beaks. During droughts, the surviving birds will have larger beaks, and there are fewer birds.

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Big Ideas

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  1. Big Ideas From Gizmo Activities

  2. Birdbeak Gizmo • Organisms ADAPT to their environment over time; the most fit organisms survive to mate. • During normal rainfall, most birds will have average sized beaks. • During droughts, the surviving birds will have larger beaks, and there are fewer birds. • During plentiful rainfall, average beak size is favored, but the environment can support more birds (population size).

  3. Food Chain Gizmo • The sun is the source of all energy on earth. • There are lower numbers of organisms at higher trophic levels (“up” on the pyramid) because it takes more prey than predators (the predators need their “next meal”). • When disrupted (excess rain or drought, fire, hurricane, etc.) a system will work to reach equilibrium.

  4. EXTRA! • Initially, a disruption in any level (diseased rabbit, diseased grass, etc.) will have effects on all trophic levels until equilibrium can be reached. • When making a food chain, the arrow points FROM the prey TO the predator. • Food webs are complicated food chains. • Only 10% of energy is passed on each level of a food chain.

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