Place the events in chronological order

3, 4, 2, and 1   (I numbered them 1-4 starting from the top)

Explanation:

First weathering breaks down rocks to form sediment, Then that sediment as well as fossils and bones from animals and plants get added together. Then flowing water adds clay or calcite to the mix, hardening them all together. Finally, after many years the rock has turned into hard solid rock with several types of inorganic and organic materials in it.

(I hope this helps you!)

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.