Please take a look at the video lessons on The Scientific Way of Thinking to understand how VERA supports scientific modeling.

Logistic Growth

This is a model of logistic growth for domestic sheep, Ovis aires. Logistic growth only occurs with the domestic sheep not the grass, Dactylis glomerata. The sunlight supplies the grass nutrients.

In the ecosystem, the domestic sheep begin growing exponentially. But once the resources start dwindling and the population growth decreases overtime. Until the domestic sheep hit their carrying capacity and the resources can no longer support population growth.

In VERA, make the simulation only 180 months since VERA caps populations over a certain period of time (making the graph logistic growth). Also make sure the lifespan, reproductive maturity, and reproductive intervals of sheep are similar to the encyclopedia of life values. You should decrease the reproductive maturity and reproductive interval of grass.

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