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Question 4
A
substances from a region of high concentration to a region of low concentration 
B
substances from a region of low concentration to a region of high concentration across a living cell membrane 
C
substances across a living cell membrane using energy from the cell 
D
movement of molecules in a medium 
Explanation.
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Correct Option:
B
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Question 7
A
lll, ll,lV,l. 
B
ll, lll, l,lV 
C
ll, l, lll, lV 
D
II, IV, I, III. 
Explanation.
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Correct Option:
B
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Question 8
A
always involves one parent but the offspring is genetically different from the parent. 
B
may involve two parents but the offspring is always identical to one parent 
C
always involves one parent and the offspring is genetically identical to the parent 
D
involves two parents but the offspring is not genetically identical to any of the parents 
Explanation.
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Correct Option:
C
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Question 10
A
impulses fromreceptors in the legs cannot travel to the brain 
B
impulses from the brain cannot travel to the legs 
C
chemical substances will be released at synapses in the central nervous system 
D
reflexx actions cannot take place in the legs 
Explanation.
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Correct Option:
A
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