Animal Characteristics Characteristics Eukaryotic Multicellular Ways of moving

Animal Characteristics

Characteristics ►Eukaryotic ►Multicellular ►Ways of moving that help them reproduce, obtain food and protect themselves ►Have specialized cells that form tissues and organs ►Animal cells do not have cell

Characteristics ►Adults mostly fixed in size and shape ►Heterotrophic ►Must digest food

Development of Animals ►Most develop from single, fertilized egg call a _________. ►Males produce _____, females produce ____. ►Fertilization occurs when an egg is penetrated by a sperm ►Fertilization may be internal or external

Development of Animals ► Unicellular zygote divides by mitosis ► Embryo develops until blastula formed ► Blastula develops into gastrula § Inner layer of cells called endoderm, develops digestive organs § Outer layer of cells called ectoderm, develops into skin and nervous tissue

Development of Animals ►Gastrula develops until mesoderm formed ►Mesoderm = muscles, circulatory, excretory system

Symmetry ► Asymmetry – no

Symmetry ► Radial – think equal slices of pie

Symmetry ► Bilateral – animals have anterior, posterior, dorsal and ventral surfaces

Posterior – butt, bottom Anterior – head, front Dorsal – back side Ventral – stomach side

Animal Protection and Support ► Exoskeleton or endoskeleton § Hard outer protection or inner skeleton to protect ► Invertebrates and vertebrates § Without backbone vs. with backbone