Ichthyosaurs, now extinct, were aquatic reptiles with dorsal fins and tails, similar to those of fish. their most recent ancestors were terrestrial reptiles that had neither dorsal fins nor aquatic tails. the dorsal fins and tails of ichthyosaurs and fish are ichthyosaurs

Which of the following best illustrates the importance of addressing the three questions of economics? people’s desires and needs are always changing. businesses need to use limited resources wisely. traditional methods of production are outdated. businesses need to limit production.