Biological

Biological units are StarCraft units that consist primarily of non-mechanical components.

StarCraft

Biological units are vulnerable to a wide array of effects, such as a science vessel's Irradiate ability and the queen's Spawn Broodling ability. However, they are immune to effects such as the ghost's Lockdown ability.

They include all zerg units, terran SCVs (also counted as mechanical), marines, firebats, ghosts and medics, and protoss zealots, high templar and dark templar.

StarCraft II

Science vessels irradiate can still damage anything that is biological and the queen, medivac and medic can heal anything biological.

All Zerg units and structures can self heal.

Protoss

• Dark templar
• High templar
• Zealot

Terran

Infantry units

• Ghost
• Marine
• Marauder
• Reaper
• SCV (also mechanical)
• Firebat
• Medic
• Spectres

Zerg

All zerg units and structures.

Weaknesses

• Archon: +10 vs biological