The answer and just say the answer no links

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Someone me with this: a mineral' is determined by its actomic structure.

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun