Answer: i think its C. but find another source just in case.
It gives them food to be able to grow
One method I know of is comparing a sample of the rock to other samples which the scientist already knows the age of. I forgot what this method is called but I know it's used by lazy scientists that use other scientist findings like the age of a rock to compare to their own work
Yes biotic means living or once living. it was living at one point so yes its biotic
