What’s the difference between a primary source and a secondary source? A primary source was written by someone who actually experienced the event. The difference is about where the source appears—online or in print. Primary sources are shorter than secondary sources. The difference is about how closely the source re

one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

a symbiotic relationship with the mitochondria

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.