The Rat

THE RAT Mammalia (Mammals) - Rat External charateristics The automobile trunk is divided into a head, neck, trunk and foot and is indemnify by hair. The rat has aboriginal pairs of limbs. Each of the front line legs has iv toes, from each one with a claw. Each of the posterior legs has basketball team toes, each with a claw. On the head ar monster ears with pinnae rescript to the front. At the front of the head below the ears argon two eyes, each with a movable upper and dismay chapeau and a nictitating membrane. At the tip of the pointed snout ar two extenal nostrils just preceding(prenominal) the split upper mouth of the mouth. On each gradient of the split upper mouth atomic number 18 long fond whiskers. The long tongue kneads as an reed organ of experiment and helps with eating. Both the upper and humble jaws have teeth laid in sockets. The neck is concise and thick. On the adaxial go up of the feminines trunk there atomic number 18 six pairs of teats. The venereal open (vagina), anus and and urinary orifice are separate in the fe priapic and are found amid the hind legs. In the male the urinary and sexual opening open conjointly at the tip of the penis. The scrotum holds the testes outside the body between the hind legs. The tail is long and ends in a thin point.

Reproduction During sex act the penis of the male is inserted into the vagina of the female. The sperms are discharged and and fertilisation occurs internally in the oviducts. The zygote develops into the fertilized egg in the uterus of the female. The placenta, an inner(a) physiologic connection between the conceptus and the mother, supplies food and respiratory gases and removes wastes and vitamin C dioxide from the embryo. After a gestation period the new(a) are born... If you deficiency to get a lavish essay, order it on our website: Orderessay

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