The Biologist has a lot of important roles to play.
The team is going to require:
An understanding of the life forms that have been discovered. Are they relatable to what is on earth? Can they be classified? Is this a new classification to add to “Life”?
An understanding of the surrounding environment on the human team members.
An understanding of the Flora as well as the Fauna. Are there any fossils? Can we determine how life developed?
There are lots of other questions a Biologist will need to cover, too many to list here.
How do you achieve this?
I am sure there are lots of other things that I have not mentioned. As Chief Biologist it is your job to ensure that you can advise on all things related to Biology.
Of course, in any scientific field, you need to be clear about your assumptions and what you have based them on (if any).
Create mind maps, equations, drawings, descriptions, classification trees, in fact, anything that is going to show your knowledge of Biology.
If you choose to create something physical - take photos of them and ensure that they are submitted as part of the final presentation.