The occurrence of large or small beak size among seed crackers in the absence of medium sized beaks is an example of
1) directional selection
2) disruptive selection
3) normal distribution
4) stabilizing selection

ι вєℓινє тнє αиѕωєя тσ уσυя qυєѕтισи ιѕ в. ℓуѕσѕσмє

ι нσρє тнαт ι ¢συℓ∂ нєℓρ уσυ.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.