Which phrase describes the relative age of a rock?
uses the law of superposition to determine which rock is older or younger
can determine the age based on location of a rock within the same layer
requires only one rock to determine the age
can provide the exact age of a rock

Uses the law of superposition to determine which rock is older or younger

Explanation:

When you say relative age of a rock, you are determining the age of a rock relative to another rock. In the case of superposition, you are determining the relative age of a layer of rock by comparing it to the position of another rock layer.

The law of superposition states that the younger rock layers will be found higher. So the deeper the layer is found, the older the rock layer will be compared to those on top of it.  

I belive it's c

Explanation:

It origanally provides the basis for the law of superposition.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.