[nGenYoda]

What Edge said.
In simple terms Larva -> produces both army and workers, unlike other races which can simultaneously produce workers and units. Managing larva (ie droning / army production) is a reaction to the stimuli ( scouting a push coming, etc).

[TAhackdZ]

Originally Posted by nGenYoda

What Edge said.
In simple terms Larva -> produces both army and workers, unlike other races which can simultaneously produce workers and units. Managing larva (ie droning / army production) is a reaction to the stimuli ( scouting a push coming, etc).

Bingo +1

It all comes down to the simple matter that Zerg need to choose to turn each individual larvae into either a drone, or a combat unit.