Which fingerprint pattern does Sam have? Sam's thumb print shows a flow of ridges that enters from one side and exits from the other side, with a gradual rise in the center. Sam's fingerprint has the arch pattern.

Plain arch pattern.

Explanation:

Fingerprint is an impression of the friction ridges of all or any part of the finger. Plain arch in the fingerprint-pattern- drawing is where the papillary ridges enter, on one side, curve in the center and exit or tend to flow on the opposite side. Statistics in the population with this pattern 5%. The plain arch does not have ridges forming angles, nor does it have raised ridges.

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.