Cytoskeletal structures on the lining of the respiratory tract are needed to dust and debris away

this would be a math

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.