The upcoming discussion will update you about the difference among the three groups of mammals. Difference # Prototheria: 1. Prototheria is oviparous. 2. Pinna is absent in prototheria.z 3. Prototheria has no nipples (mammae). 4. No marsupial pouch is present in prototheria. 5. in Prototheria, digestive and urinogenital tracts open into a cloaca. Cloaca opens outside through cloaca aperture. 6. [...]
The below mentioned article provides biology notes on Eucoelomates. The animals which possess true coelom are called eucoelomates or coelomates. The true eucoelomates is a body cavity which arises as a cavity in embryonic mesoderm. In this case, the mesoderm of the embryo provides a cellular lining, called coelomic epithelium or peritoneum, to the cavity. The eucoelomates is filled with [...]
In this article we will discuss about the General Characters and Classification of Phylum Aschelminthes. General Characteristics of Phylum Aschelminthes: Some of the general characters of phylum Aschelminthes or Nemathelminthes are as follows: 1. Habitat: Many roundworms live as parasites in plants and animals. They cause serious agricultural, veterinary and human health problems. Round worms are also free living and [...]