Energy & Equilibria (SL IB Environmental Systems & Societies (ESS))

Define the term entropy.

Below are two examples of stable equilibria.

Identify the name of each type of stable equilibrium.

When a population is exposed to a disease, some individuals will be more resistant to the disease than others. Those individuals who are more resistant to the disease will be more likely to survive and reproduce. This will lead to an increase in the proportion of resistant individuals in the population.

As the proportion of resistant individuals in the population increases, the disease will have a harder time spreading. This is because there are fewer susceptible individuals for the disease to infect. This will lead to a decrease in the prevalence of the disease in the population.

Identify the type of feedback being demonstrated in this example.