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.
Definition. An introductory paragraph is the opening paragraph in a conventional essay, composition, or report. The primary purpose of an introductory paragraph is to attract the reader's attention and identify the topic and purpose of the essay. A thesis statement often appears at the end of an introductory paragraph. See Examples and Observations below. Also see: 1  How to Begin an Essay: 13 Engaging Strategies With Examples. 2  Five-Paragraph Essay. 3  Hookers vs. Chasers: How Not to Begin an Essay. 4  Imperative Sentence. 5  Introduction.