Cretaceous Period

Cretaceous Period

The Cretaceous Period (144 - 65 Myr BP) is the third of three periods during the Mesozoic Era. It is preceded by the Jurassic Period and followed by the Tertiary Period.

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Industry/Domain: Zoology
Category: Zoological terms
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Cretaceous

Archaeology; Evolution

The final geological period of the Mesozoic era that began 144 million years ago and ended 65 million years ago. The end of this period is defined most notably by the extinction ...

Period

Natural environment; Coral reefs

In the geologic time scale, a unit of time less than an era and greater than an epoch.

phylum placozoa

Zoology; Zoological terms

Macroscopic, flattened marine animals, composed of ventral and dorsal epithelial layers enclosing loose mesenchyme-like cells.

phylum cnidaria

Zoology; Zoological terms

Cnidarians. Hydras, hydroids, jellyfish, sea anemones, and corals. Free-swimming or sessile, with tentacles surrounding the mouth. Specialized cells bearing stinging oraganoids ...

rudimentary

Zoology; Zoological terms

Involving or limited to basic principles; immature, undeveloped, or basic.

endocrine

Zoology; Zoological terms

Pertaining to ductless glands that produce hormones.

endoparasite

Zoology; Zoological terms

A parasite that lives within the tissues or bloodstream of its host.

endothermic

Zoology; Zoological terms

Able to maintain a constant, warm body temperature, regardless of external conditions.

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Industry/Domain: Earth science Category: Geology

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