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Characteristics of Animals
eukaryotic, multicellular, lacking a cell wall, heterotrophic, embryonic development includes blastula and gastrula stages, gametic life cycle
Blastula
an undifferentiated ball of cells that forms early following in embryonic development in animals
Gastrula
an early stage in animal development in which the cells begin to form distinct layers in a hollow ball of cells
Radial Symmetry
body plan symmetry in which two identical halves can be derived from any given diameter
Bilateral Symmetry
body plan symmetry in which two mirror halves can be seen from only one planar division
Cephalization
having a head; a clustering of nervous tissue and sensory organs at one end of an animal's body
Anterior
the end of the animal with the head
Posterior
the end of the animal opposite the head
Dorsal
the upper or back surface of an animal
Ventral
the surface of an animal opposite the dorsal surface
Lateral
side surfaces of an animal
