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Match the following columns.
\begin{tabular}{lll}
\hline & \multicolumn{1}{c}{ Column I } & \multicolumn{1}{c}{ Column II } \\
\hline A. Tiny air sacs in the lungs & 1. Internal respiration \\
\hline B. & Gas diffusion between alveoli and blood in lungs & 2. Haemoglobin \\
\hline C. & Gas exchange between environment and lungs & 3. Alveoli \\
\hline D. & Molecule specialised for oxygen transport & 4. External respiration \\
\hline
\end{tabular}
(A) \( \begin{array}{cccc}\mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} \\ 3 & 1 & 4 & 2\end{array} \)
(B) \( \begin{array}{cccc}\mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} \\ 4 & 3 & 2 & 1\end{array} \)
(C) \( \begin{array}{cccc}\mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} \\ 1 & 2 & 3 & 4\end{array} \)
(D) \( \begin{array}{llll}\text { A } & \text { B } & \text { C } & \text { D } \\ 2 & 1 & 4 & 3\end{array} \)
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