24. The word "they" in line 3 refers to (A) skeletons (B) scavengers (C) creatures (D) environments

23. The passage supports which of the following conclusions? (A) Some species of ichthyosaurs decayed more rapidly than other species. (B) Ichthyosaur newborns are smaller than other newborn marine reptiles. (C) Ichthyosaurs were more advanced than terrestrial creatures. (D) Ichthyosaurs may have gathered at Holzmaden to give birth.