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.
Major Body Cavities. 1. Cranial cavity: cranial means skull, this cavity is located in the head superior the medial, and is surrounded by the skull. It also contains the pituitary and endocrine glands.2. Thoracic cavity: thoracic means chest, this cavity is located in the anterior portion of the body and the mediastinum.It contains the cavity that surrounds the breast bone and ribs. Containing the lungs, heart, trachea, larynx and bronchial tubes.3.. Cranial cavity: cranial means skull, this cavity is located in the head superior the medial, and is surrounded by the skull. It also contains the pituitary and endocrine glands. 2. Thoracic cavity: thoracic means chest, this cavity is located in the anterior portion of the body and the mediastinum.