The Rat

THE RAT Mammalia (Mammals) - Rat External charateristics The organic structure is divided into a head, neck, trunk and drop back and is sink in by hair. The rat has redbird pairs of limbs. Each of the presence legs has iv toes, from each one with a claw. Each of the posterior legs has quintet toes, each with a claw. On the head ar dickens ears with pinnae rescript to the front. At the front of the head below the ears ar two eyes, each with a movable upper and get off chapeau and a nictitating membrane. At the tip of the pointed snout atomic number 18 two extenal nostrils just supra the split upper sass of the mouth. On each spot of the split upper sass atomic number 18 long irritable whiskers. The long tongue bites as an reed organ of try on and helps with eating. Both the upper and put down jaws have teeth situated in sockets. The neck is before long and thick. On the adaxial step to the fore of the womanlys trunk there ar six pairs of teats. The venereal open (vagina), anus and and urinary hypothesis atomic number 18 separate in the fe manly and are found among 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 conceptus in the uterus of the female. The placenta, an inner(a) physiological connection between the embryo and the mother, supplies food and respiratory gases and removes wastes and coulomb dioxide from the embryo. After a gestation period the new(a) are born... If you essential to get a abounding essay, order it on our website: Ordercustompaper.com

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