Multicellular and form tissues (except Sponges)

Heterotrophs Diploid Reproduce sexually and in some cases

asexually Most animals are motile during at least one

part of their life cycle Life cycle: embryonic development

◦ Zygote-multicellular embryo-germ tissue layers-adult

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Three Types Ectoderm-outside section that involves the

epidermis (skin) and nerve tissue areas. Mesoderm-middle section that involves the

outside of the gut-like muscles, organs, bones, etc

Endoderm-innermost section that involves the gut

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#1 Body Symmetry (Three Types) Asymmetry –irregular (ex. Sponge) Radial-Divided along any plane (ex. Hydra) Bilateral-Divided down length into similar

right and left halves, forming mirror images of its parts(ex. Flatworm and earthworm)◦ Anterior-Head end◦ Posterior-tail end◦ Dorsal-back surface◦ Ventral-belly surface

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# 2 Type of Gut (Two Types) Incomplete-Food and waste enter and exit

from the same orifice (opening) Complete-Food enters via the mouth and

waste exits via the anus

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#3 Body Cavities (4 Types) Acoelomate –No gap between the gut and

the mesoderm (ex. Flatworm) Pseudocoelomate-They have a cavity but no

peritonoum lining. Pseudo because it is filled with fluid and partly lined with mesoderm (ex. Roundworm)

Hemocoel-Blood fills the cavity and there is an open circulation system (ex. Insects)

Coelomate-has a distinct peritoneum (lining surrounding the mesoderm) (Ex. Humans)

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#4 Segmentation

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