The atomic number of an element is the total number of which particles in the nucleus?
a. neutronsc. electronsb. protons

Light waves can move through , but they travel fastest when they move through a(n) .

Correct relationship between molecular formula and empirical formula

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a.soft fossils b.mold fossils c.index fossils d.trace fossils