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Chapter 25

Animal Characteristics

QuestionAnswer
Organisms that are permanently attached to a surface are called Sessile
A cell-covered fluid-filled ball that results from cell division following fertilization. Blastula
Occurs when cells on one side of the blastula move inward to form an opening. Gastrula
The layer of cells on the outer surface of the gastrula. Ectoderm
The layer of cells lining the inner surface of the gastrula. Endoderm
A third layer of cells in the gastrula that result from continued cell division and is located between the ectoderm and the endoderm. Mesoderm
When the opening in the gastrula develops into the mouth. Protostome
When the mouth developed not from the opening of the gastrula, but from cells elsewhere on the gastrula. Deuterostome
A term referring to the arrangement of body structures. Symmetry
The animal can be divided along any plane, through a central axis, into roughly equal halves. Radial Symmetry
Type of symmetry in which the animal can be divided down its length into sililar right and left halves. Bilateral Symmetry
The "head" end of an animal Anterior
The "tail" end of an animal Posterior
The upper surface of an animal Dorsal
The lower surface of an animal Ventral
The animal develops from three cell layers, the ectoderm, endoderm, and mesoderm, but have no body cavities. Acoelomate
Develops between the endoderm and mesoderm ... a fluid-filled body cavity partly lined with mesoderm. Pseudocoelom
A fluid filled space that is completely surrounded by mesoderm. Coelom
A hard covering on the outside of the body that provides a framework for support ... protects soft body tissues, prevents water loss, and provides protection from predators. Exoskeleton
An internal skeleton covered by layers of cells and provides support for an animal's body, protects internal organs, and provides an internal brace for muscles to pull against.` Endoskeleton
An animal that does not have a backbone. Invertebrate
An animal with an endoskeleton and a backbone. Vertebrate
Created by: cwear
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