Me .

why does earth rotate?

a.)because earth is formed from cold gases collapsing due to gravity

b.)because the matter in the nebula that formed earth was spinning

c.)because earth forms more than 99% of the mass of the solar system

d.)because the hydrogen atoms inside the nebula fused to form helium

Which statements describe polyatomic ions? check all that apply. polyatomic ions have many charges. polyatomic ions have one overall charge. polyatomic ions repel other ions to form ionic bonds. polyatomic ions attract other ions to form ionic bonds. polyatomic ions are made up of only one type of atom. polyatomic ions are made up of two or more types of atoms.

What does the process of natural selection involve

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms