Guyton for human physiology and D.robertes for cell and molecular biology are little lengthy,,although
D.robertes can be replaced with p.s.verma.which is written in relatively easy language.
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miller harley for zoology is good one.
But mostly seniors do not recommend zoology in css due to it's typical terminology and contents,but nothing is difficult in front of a brave heart.
Good luck.
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"Whatsoever thy hand findeth to do, do it with thy might..."
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