amplitude - a measure of how far the particles in the medium move away from their normal rest position, analog signal - a continuous wave that may vary in strength or frequency, artificial selection - the process of selecting and breeding organisms that have certain desired traits, Balance Force - forces that are opposite in direction and equal in size, Big Bang Theory - states that the universe began with a tremendous expansion 13-15 billion years ago, Common Ancestry - similarities/differences in internal structures support evidence of this, convection current - causes tectonic plates to move, convergent boundaries - form where two plates collide. 3 types; continental-continental, forms mountains, continental-oceanic, oceanic-oceanic, forms volcanoes from the subduction, digital signal - carries individual bits of information in separate units of time, divergent boundaries - two plates move away from each other, forms new sea floors,

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