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.
This paper examines . . ., The aim of this paper is to . . ., and The purpose of this essay is to . . . A purpose statement makes a promise to the reader about the development of the argument but does not preview the particular conclusions that the writer has drawn. A purpose statement usually appears toward the end of the introduction.