Oxygen revolution-stromatopolites
prokayotes to eukaryotes
symbiotic relationships amongst specialized prokaryotes
lynn margulis
organelles (mitochondria, chloroplasts, etc) all have their own DNA
eukaryotes as acellular protists
amoeboid
flagellate
ciliate
no means of  locomotion
acellularity to multicellularity

sponges Porifera
multicellular
specialized cells
choanocytes (collar cells)
pinacocytes
porocytes
amoebocytes
diploblastic ectoderm endoderm tissue level of construction division labor
cellular specialization

chelating agent

coelenterates Cnidaria
Hydra Hydrozoa
jellyfish Scyphozoa
coral reef Anthozoa
sea wasps Cubomedusae

alternation of genrations
polyp and medusae
asexual sexual generations