Chapter 1
Counting and Operations with Whole Numbers
Course: Elementary Education Assessment 5006
Subject: Mathematics And Science 5008
Chapter: Life Sciences 1
Ecosystems are complex, dynamic systems where living organisms interact with one another and with their physical environment. Understanding how energy flows, how matter cycles, and how populations respond to environmental change is essential for mastering ecological concepts. This lesson examines trophic levels, food webs, nutrient recycling, plant reproduction, and ecosystem balance, emphasizing cause-and-effect relationships that frequently appear in Praxis Science (5008) scenario-based questions.
Ecosystem Components and Interdependence
Ecosystem
An ecosystem is a community of organisms plus the physical environment, functioning together as a unit. The key idea is interaction: organisms depend on the environment for resources, and they depend on each other through feeding relationships, competition, and symbiosis. An ecosystem is stable only when energy enters continuously (mostly from the Sun) and nutrients cycle efficiently through living and nonliving parts of the system.