Help, please !! triangle FGH is inscribed in the circle above. If FG is congruent to GH and the measure of G is 30 what is the measure of H

Which statements about the two fossil images are correct? 1. cave bears are ancestors of plateosaurus. 2. plateosaurus were present on earth before ostracoderms. 3. ostracoderms were the first to die. 4. plateosaurus died after the ostracoderms. 5. cave bears are the oldest fossils.