This document discusses how organisms are connected through shared resources like air, water, sunlight, and space. It states that if something impacts one organism, it can affect others, and that human actions impact the biosphere. For example, damage to coral reefs can kill the organisms that depend on them. The document also explains that organisms depend on their environment to meet their needs through biotic and abiotic factors, and that organisms in an ecosystem have adaptations that help them survive there.