The introduction includes the thesis statement which is to evaluate the water quality of Mandulog,
Tambacan and Timoga estuaries in Iligan City using macroinvertebrates as the bioindicators. It
introduced the background of the study and gave the scope and main point of the whole research. It
started off with the main idea to the specific ones. The variables of the study were well explained and
supported by different references.
Each of the paragraphs expands a new point of the study. It also starts with the topic sentence which
was developed further in the paragraph. The introduction’s discussion started with macroinvertebrates
which are animals that have no backbone and can be seen with the naked eyes. They generally include
insects, crustaceans, molluscs, arachnids, and annelids. Then the estuaries, which provide habitat for
macroinvertebrates due to the presence of high level nutrients from the inflows of both seawater and
fresh water. Macroinvertebrates are good indicators of freshwater health because of their long life
period and limited mobility. Bioassessment has been used to evaluate the ecological status of estuaries
with implications for water management. Then...
