A) is your best answer.
Relative Dating gives the 'relative dating', which allows one to find the difference of age between many different of fossils. However, radioactive dating is used to get a more exact measurement of a fossil, but it can only be used for certain types of fossils.
hope this helps
About only ten precent of energy is carried from each step in the food chain so the initial 100 percent then 10 precent then one precent the 0.1 precent then 0.01 then finally 0.001 there is less biomass at the top of the food chain because they have less energy then at the bottom of the food chain
I believe the answer is Intron IV, Introns are non-coding regions while exons are the coding regions. In most eukaryotic genes, coding regions (exons) are interrupted by non coding regions (introns). During transcription, the entire gene is copied into a pre-mRNA splicing, introns are removed and exons joined to form a contiguous coding sequence.