Dr. Endi Gauci concludes a series of lessons in Environmental Biology, covering topics such as populations, symbiotic relationships, predator-prey dynamics, and abiotic and biotic factors in ecosystems. The session transitions to practical application by addressing questions on the stabilization of the lizard population, highlighting factors like resource limitations and reduced predation due to a virus. Worksheets are available to consolidate understanding, and additional examples will be provided for further illustration.