biology help plz?????????????????

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Complete the following paragraph relating to the enzyme, β–galactosidase. This enzyme hydrolyses the disaccharide lactose to constituent monosaccharides, galactose and glucose. Drag and drop the appropriate words into the correct space. For white spaces in the sentences select from the following below
The enzyme β-galactosidase is added to a solution of lactose: over time, the number of
water molecules present in the solution (1)………………….At the same time the number of
molecules of lactose in the solution (2)………………………….and the number of molecules of
galactose and glucose in the solution (3)…………………………….. The number of molecules of β–galactosidase in the solution(4) ………………………… .

1) decreases
2) decreases
3) increase
4) …………?…………….(I don’t know) I need the correct answer for this

Could you plz tell me the last one which one is correct from the following, I need the correct answer please. Thanks

a) Increases
b) decreases
c) stays the same
d) increase
e) decrease
f) stay the same

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