This document discusses ecosystems and ecology. It covers topics like abiotic and biotic components, producers and consumers in ecosystems, energy flow and nutrient cycling, trophic levels, biogeochemical cycles, human impacts, conservation biology, causes of species extinction, sustainable development, and alternatives to modern agriculture. Key components include producers using sunlight to produce organic nutrients, consumers obtaining energy and nutrients by eating producers or other consumers, and decomposers recycling nutrients.

1. PLANTS AND ECOLOGY PART 2

2. CHAPTER 34 & 35 UNIT 3 LESSON 4

25. CHAPTER 36 UNIT 3 LESSON 5