Radiometric dating . See Concept 25.2 (Page) View Available Hint(s)for Part A allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata only works on rocks younger than 75,000 years allows us to determine an absolute, errorless date relies on the fact that the daughter isotope decays to the parent isotope at a constant rate can be used to directly date fossils in sedimentary rock

It is c. naturally in the environment

Answer meranesia;

The reason why i feel that the theory of plate tectonics is correct because scientists have found dinosaur bones of the same species in africa, asia, and in the americas. which means that they must have been together at one point in time. plate tectonics is also how the hawaiian islands were formed. as the plate hawaii is on was moving north west, magma would melt through the sea bottom and hardening. forming into the island chain. plate tectonics also explains the mariana trench. two plates were moving away from each other and made a giant crack in the ocean floor running 2,550 kilometers (1,500 miles)  long.

The 3rd one