From Astro Wars
Biological Scanners and Autonomic Biosystems are the main fields of research. It increases your range of vision on the Map Screen, allowing you to see other neighboring systems, the planets present, their ownership, Population level and Starbase level.
With every second level of Biology you are able to see an additional 'squares' distance on the map from your original star system. As your fleets can travel to any Star System you can see on the Map Screen, increasing your Biological Science increases the distances your fleets can travel.
Once you reach level 25, you will have developed your Autonomic Biosystems far enough to send fleets to any location in the galaxy by using the System ID of the target system, instead of its name.
If you use this method of destination targeting to travel to planets outside your visual range, then any reference to the planet or system will use the System ID not the system name, regardless of whether or not you conquer such a planet (it will still be displayed as " 7" etc).
Main Article: Intelligence Report
If your Biology level is six or more levels higher than another player within your field of vision, and you can see their home system, you will be able to obtain an Intelligence Report on that player, revealing all Science levels attained by that player, as well as their Race information. This makes researching Biology a valuable expenditure of time, contributing to Reconnaissance.