Fossil a is found in a rock layer 200 meters below the surface of the ground. fossil b is found in the same rock formation but at a depth of 150 meters. which fossil is probably older?

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

explanation:

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•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

. the sierra madre fault zone of southern california

. the san andreas fault california