Staphylococcus aureus is a species of bacteria that have invaded the human body for a long time. Humans scientifically created an antibiotic, methicillin, to fight off the bacteria, but in return, the
Staph bacteria developed resistance to the methicillin and are now considered a new strain called
methicillin-resistant Staphylococcus aureus (or MRSA.) Therefore, humans had to develop even
stronger antibiotics to fight it. What pattern of evolution does this exhibit?

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

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.