Answer:
shale, limestone and sandstone.
Explanation:
Radiometric dating reveals the exact (i think its exact) age of a fossil.
Remember gcau, G pairs with C and A pairs with u G-C A-U
B.
Homogeneous means one mixture, so like salt water. It looks like one mixture.
Heterogenous means different mixture. Comparable to a bag of Chex mix. So if the magnet can attract the pieces of Iron, it has to be a separable mixture. Compounds would require a chemical reaction to separate.