3) All of the following statements are true EXCEPT a) Hydrogen fons have different chemical properties from elemental hydrogen
b) Carton isotopes have different chemical properties from elemental carbon
) Carbon14 has 6 protons & & neutrons
d) tons have equal numbers of protons & neutrons

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?