Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are...

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Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic.