___ competiton drives natural selection, as individual members of a species compete with each other for limited natural resources.

Forces that are equal in strength but opposite in direction are a.) balanced b.) unbalanced c.) always result in motion d.) do not exist

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons