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.
In order to do so, you will need to come up with a good Essay Introduction. Function. An Essay Introduction is very important to the overall paper. The introduction to an essay, which is sometimes referred to as a prolegomenon, tells a reader the objective and purpose of the work. It acts as a blueprint of sorts for the essay as a whole; illustrating the central case behind your writing and the line of reasoning that you will follow throughout.