What is the mass of 12.4 molecules of carbon tetrachloride?

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?