phylum class characteristicsand its reproduction and development

In rats, as in all vertebrates, sexes are separate. Male and female exhibit several differences in their external features. The Male reproductive system consists of a pair of testis that are enclosed in scrotal sacs, a pair of vas deferens, a seminal vesicle, ejaculatory duct and penis. T..

Reproduction and Development..

Reproduction and Development..

Reproduction and Development..

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Introduction - An animal performs all its life functions with an aim to be alive till it matures and reproduces. Reproduction is the ability of living organisms to produce new individuals similar to themselves. Reproduction ensures perpetuation and survival of their species. It ..

Phylum Annelida - Free-living, terrestrial or aquatic form (freshwater or marine). Body is long, cylindrical and metamerically segmented. Body wall consists of cuticle, epidermis and musculature. Body cavity is a true coelom, lined by epithelium. Digestive system is complete. Respiration ..

Phylum Platyhelminthes - Bilaterally symmetrical, triploblastic true multi-cellular animals with organ grade of organisation. Free living (aquatic or terrestrial) or parasitic (ecto- or endoparasites). Body is dorso-ventrally compressed, leaflike. A body cavity is absent. Space between bo..