12.
to be classified as organic, a chemical's molecules must be
based on carbon
based on oxygen
decomposed
living

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

Consider the story you just read. all but one of the choices below indicate that something is living.

The earth's surface is (science) a: studied using seismic waves b: constantly changing over time c: only studied indirectly d: the same today as million of years