Endosymbiosis A mutualistic association of a bacterium within the eukaryotic cell.
Some algae have chloroplasts resulting form a endosymbiosis of a photosynthetic eukaryote.
Eukaryotes Taxonomists generally recognize 5 kingdoms 1. Oomycetes are basically algae that have lost their chloroplast, or conversely a group that did not gain one. A large group estimated to have over 1 million species Closely related to animals similar mitochondria mitochondrial genetic code the same stores glycogen rather than starch lacks chloroplasts - heterotrophic a chitonous exoskeleton have a single posterior cilium Animals PreCambrian forms were soft bodied. Vertebrates Prior to this, all animals had Exoskeletons . Amphibians - soon followed and had much to eat, many different food sources.