prehistoricRelating to or denoting the period before written records.
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Denoting the period before written records."He was fascinated with prehistoric cultures."
submarineA large underwater ship or a submersible machine.
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A warship with a streamlined hull designed to operate completely submerged in the sea for long periods."The crew boarded the submarine."
survivalThe state of continuing to live or exist, in spite of difficult circumstances.
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The state or fact of continuing to live or exist, in spite of difficult circumstances."Survival in the wilderness requires basic outdoor skills."
plesiosaurAn extinct marine reptile of the Mesozoic era.
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A Mesozoic marine reptile with a broad flat body, large paddles, and typically a long flexible neck."She marveled at the plesiosaur skeleton in the museum."
primitiveRelating to an early stage in evolutionary development; primeval.
Definitions:
Relating to an early stage in evolutionary development."Primitive plants are usually green algae."