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primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought to be closely related to the ancestor of the first amphibians.
when a person uses their breath to help another person who has stopped breathing, in an attempt...
single-celled floating algae, which provide food for marine animals, such as fish and whales....
kingdom of multicellular eukaryotic organisms that do not have cell walls, feed...
a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...