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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