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(a) How many million year ago, gigantic reptiles used to dominate on earth ? Give their common name and also mention the period and year in which they were predominanat on earth. (b) Why did these gigantic reptiles disappear from the earth in a short duration ? (c ) Name the most advanced living reptiles. List atleast two characters in which they resemble in mammals.

________are a type of inexpensive digital camera that remains tethered to a computer and used for video conferencing, video chatting and live web broadcast.

A : Poultry farming has definite advantage over live-stock rearing R : Poultry birds are easy to raise, can be acclimatised to a wide range of climatic conditions, have short life span and are prolific breeders

In monocotyledonous plants e.g., wheat, the primary root is short lived and is replaced by a large number of roots, these roots orginate from the base of the stem and consitute the-