Help me with this question..... please..........?

Question

http://www.boardofstudies.nsw.edu.au/schoolcertificate/sc_science.html

2007, Any answer for any of these questions would be helpful

Q. 29,30,31,32,33,34,35

Answer 1

29) D

30) A

31) A

32) B

33) A

34) C

35) D