Top 10 unbelievable historical concurrencies. A zygote is a single cell which has formed as the result of the merging of an egg cell and a sperm cell. In other words, it's a fertilized egg, with the potential to develop into a living organism.
Gastrovascular system of the flatworm Dugesia, colored yellow. The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals. In cnidarians, the gastrovascular system is also known as the coelenteron, and is commonly known as a blind gut or blind sac, since food enters and waste exits through the same orifice.
Gastrovascular Cavity. Gastrovascular Cavity: As the name implies, this has a role in both the distribution of particles and nutrients to all areas of the body as well as having a role in digestion. Organisms that belong to 2 main phyla â the Platyhelminthes and the Cnidaria â have gastrovascular cavities. The cnidarians that are symmetrical have a body that is sac-like in 2 layers that are distinct â the epidermis and gastrodermis â with a jelly type layer called the mesoglea in between. Digestion that is extra cellular begins within the center cavity of the body that is sac-like.