It is important to break down the requirements of your assessment task before you start searching for information so that you can plan your approach.
BIO232 - Let's take a look at the subject outline - assessment 3 (River project):
You will investigate relationships between macroinvertebrate composition, density and diversity and current speed and other environmental variables in a reach of a typical lowland river, through field sampling, processing samples and identifying animals in the laboratory, analysing the data in sophisticated ways, and writing up a scientific report.
At first, you may feel a little overwhelmed by all of these requirements. However, with some thought and planning, you can come up with a research plan that will suit this assessment task.