Not sure if anyone can help, since it's due todayy, but I need a term. What is the term for this? A biologist who desribes, names and classifies organisms? Help would be great.

Taxonomist

The term you are looking for is taxonomist. A taxonomist is a biologist who specializes in the description, naming, and classification of organisms. They study the relationships between different species and organize them into a hierarchical system, known as taxonomy. To find this term, I performed a quick search using keywords such as "biologist who describes, names and classifies organisms". The search engine provided me with the term "taxonomist" as the answer to your question.