The exoskeleton of a housefly is made up of A. keratin. B. chitin. C. lignin. D. All of the above

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

In which reaction is precipitation occurring?

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number