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.
The dorsal cavity, which is located along the BACK of the body and head, contains organs if the nervous system that coordinate body functions. The ventral cavity, which it's â¦ located along the FRONT of the body, contains the body organs that maintain homeostasis.2 people found this useful. I think there are only 2 cavities that the dorsal cavitiy encompasses and those are the cranial cavity and the spinal cord. The human dorsal cavity consists of the cavities in the posterior of the torso and head, including the cranial cavity and the vertebral column.