Ch.28-p.1

Biology I

(Ch.28-Kingdom Animalia)

Animal Characteristics

- eukaryotic

- multicellular

- heterotropic-consumers-digest

- mobile

- cell membranes

- reproduce

Development

Egg + sperm = fertilized egg

Blastula – hollow ball of cells

Gastrula – enfolding of the cell wall

Germ cell layers

Zygote- fertilized

egg in early

development

ectoderm

mesoderm

endoderm

embryo

fetus

baby