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Plz help in this bio Olevel past paper 3 questions! PLZ READ

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This paper is taken from bio/3/1998
Plz suggest me right answer for these questions and tips. May Allah bless you all!
I 'll be doing O'level in 2012 may/june !!
Plz seeee it!
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U can probably get the 1990s Mark scheme at freeexampapers.com
Once opened go to IGCSE n u no the rest
 
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Q1 a-1-cell B is bigger than cell A.
2- cell A has no nucleus while cell B has it.
3- cell A is disc shaped but cell B is irregular in shape.
a-2- platelets

Pg 10
C- 1- to bring it back to normal and constant conditions.
-2- because of the action of enzymes
And for the other answers I need my book which is kind of lost right now if u need them so let me know. :) and the best way to get the correct answers is to surf out the marking scheme!!
 
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