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.
Dorsal Cavity: The dorsal cavity is an enclosed chamber that contains a portion of the body's organs and structures.The dorsal cavity is located in the posterior area of the trunk, head and neck and includes the cranial cavity and the spinal cavity.Conditions that can afflict the dorsal cavity include infection, infarction, trauma, cancer, genetic disorders, birth defects, and syndromes.orsal Cavity: The dorsal cavity is an enclosed chamber that contains a portion of the body's organs and structures.