Just like a food chain, energy enters the food web at the trophic level of the producers, which can also be called autotrophs. In the desert, autotrophs are often some type of cactus, grass, or shrub.
The main purpose of the INTRODUCTION is to give a description of the problem that will be addressed. In this section the researcher might discuss the nature of the research, the purpose of the research, the significance of the research problem, and the research question(s) to be addressed. Three essential parts of a good introduction are: RATIONALE.
Purpose of the report introduction. The best way to learn about writing introductions is to study good examples. The document, Human Rights, Health and Poverty Reduction Strategies, provides such an example: Human Rights, Health and Poverty Reduction Strategies.