The use of antibiotic is a very effective way of killing disease causing bacteria. some time people do not finish all of their pills. this can result in
Certain gases in the atmosphere water vapor,carbon dioxide,methane and nitrous oxide help maintain the earth's temperatures and climate.these are called:
Four years ago, the average age of A and B was 18 years. At present the average age of A,B and C is 24 years. what would be the age of C after 8 years?