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.
Opening Segment. The purpose of a memo is usually found in the opening paragraph and includes: the purpose of the memo, the context and problem, and the specific assignment or task. Before indulging the reader with details and the context, give the reader a brief overview of what the memo will be about.