The Evolution Chamber allows for 2 different attack upgrades: melee and missile. It's obvious zerglings benefit from the melee upgrade and hydralisks benefit from the missile upgrade, but which do roaches benefit from?
Starcraft – What attack upgrade do StarCraft 2’s roaches use
starcraft-2starcraft-zerg
Related Solutions
They use the ranged upgrade.
If you open up the galaxy editor and look at the Hydralisk/Roach you'll notice that they have two different weapons: one for range, one for melee. You'll notice that both of these attacks have the same upgrade specified.
Here we see the relationship between Zerg Missile Attacks and Hydralisk Melee
If select Zerg Missile Attacks and select Upgrade Effects+ we can see where the association is set
I'd say it is a quick and cheap way to free up some supply, for a building you'll need eventually anyway. Might also be used for wall-ins/sim city.
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Best Answer
Roaches benefit from the missile upgrade
source - sc2 armory: roach