From the first Wiggly protozoa here in the sea, to the ape, and finally to man.

With a few exceptions, most notably the sponges (Phylum Porifera), animals have bodies differentiated into separate tissues.

The Siphonophorae or Siphonophora, the siphonophores, are an order of the Hydrozoa, a class of marine animals belonging to the phylum Cnidaria.

But to a large degree, a lot of these categories deciding where to divide along kingdom, phylum, class, order, family, tribe these are somewhat arbitrary.

The corals that form the structure of the great reef ecosystems of tropical seas depend upon a symbiotic relationship with algae like unicellular flagellate protozoa that are photosynthetic and live within their tissues.

External links Water flow and feeding in the phylum Porifera (sponges) Flash animations of sponge body structures, water flow and feeding Bioerosion website at The College of Wooster Carsten's Spongepage, Information on the ecology and the biotechnological potential of sponges and their associated bacteria.

At its most basic, a phylum can be defined in two ways as a group of organisms with a certain degree of morphological or developmental similarity (the phenetic definition), or a group of organisms with a certain degree of evolutionary relatedness (the phylogenetic definition).

The staff of the sanitary inspectorate of the Department for Inspection Affairs at the local level has to undergo the sanitary examination (swabs from throat and nose, checking the stool for parasites and protozoa) and clinical examination, as well as additional tests should the doctor find them indicated, regularly, meaning at least twice a year.

The individuals involved in the process of food production are supervised at the local level by the Sanitary Inspectorate of the Department for Inspection Affairs. The staff has to undergo sanitary examination (swabs from the throat and nose, checking stools for parasites and protozoa) and clinical examination, regularly, meaning at least twice a year, as well as additional tests should the doctor find them indicated.