speaking practice

[Apple0]

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Hi, here is my response to the following lecture of the listening exercise, so please listen to my recording and pinpoint my mistakes. here is the link below;
http://www.english-test.net/toefl/listening/A_lecture_in_biology_class.html#TOEFL_Listening_Comprehension

[Apple0]

hey guys it is not easy to record the response in 60sec as mine is about 15 or 16sec above the time limit. But the purpose is to remove hesitation and the awkward sounds like aah hmm etc from the recorded response. I would really appreciate if someone check my response and grade me out of 6.