Both articles are structured in a similar matter, they start off with the title which identifies the topic of the article. Followed by the Abstract. In the abstract, they both give a brief background/summary of the topic, or argument, that they will discuss in the paper. This sections is to give a very brief explanation of the subject to give the reader an understanding of this subject, this can almost relate to the synopsis on a book.
The introduction is next. In the introduction, they elaborate more on the subject matter. The first paragraph of the this section serves to illustrate the key concepts of the topic, for example in the Baltic Sea article, it talks about how there is an acceleration in the global exchange of aquatic species to due human activity. In the article on the pool of native and non-native species, it mentions how the non-native species have been increasing in different ecosystems around the world. The introduction is in much more detail than the abstract, in this section they begin to pull in the discoveries, and comments from other scientists who have studied related topics and use those as a base for the project. It is structured in a way that it goes from the broad subject topic and gets more in depth to the problem as it goes eventually ending in the hypothesis or something they want to achieve in the paper. The last paragraph of the introduction being either what they hypothesis or are trying to prove/convey in their piece. This section is to give a deeper understanding, some viewpoints, and what is going to be tested/talked, or what they want to achieve about in the piece.
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