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.
1 Digestion and Circulation-The jellyfish has a gastrovascular cavity in which food, water and oxygen enter due to the motion of the jellyfish's mantle. 2  After the food enters the gastrovascular cavity, it is slowy digested into feces and monomers. Symmetry-radial. 2  Eating-prey are captured by tentacles of the jellyfish, paralyzed by stinging nematocyts and brought to its mouth/anus (not shown). 3  Digestion and Circulation-The jellyfish has a gastrovascular cavity in which food, water and oxygen enter due to the motion of the jellyfish's mantle.