During periods of vigorous physical activity, a persons breathing and heart rates increase . this enables the cells of the body to perform efficientlybecause it the cell to 1.convert more oxygen to glucose 2. store excess glucose in muscles 3. reproduced the amount of atp produced 4. remove waste products faster

this isn't a question and if you're going to list things be kind and use commas.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.