Learn about the many resources from Earth that humans depend upon to survive and thrive and the threats to availability that they face. [4:59]

Learn how the Bay, its habitats, and the plants and animals they support form a productive and complex ecosystem.

Mr. Lima explains how density-dependent and density-independent factors affect an ecosystem's carrying capacity in reference to a population and limits its growth. [12:18]

Humans' access to energy resources has often meant the difference between illness and health, poverty and wealth, and illiteracy and education. Learn more with this short overview. A transcript is provided as well. [2:21]

This lesson will introduce the concept of carrying capacity and show how it affects a population. It is 1 of 4 in the series titled "Carrying Capacity." [1:56]