How r u? I missed you. listen, check it again on the forum you will find it false and it is sure false , but we forget to write its correction ( NOT ALL). thanks. Mohammed why did not you come to me in the staff room in a suitable time to explain the part of "weather".do you still can not understand it ? and thank you for your excellent drawing (systems in human body). good luck . If you have any problem contact me any time of the day and tell you class mates to get in the forum , it is our class now or they will be deducted in their marks. thanks alot at all.