Consider the following elements found in a typical 70 kg man and arrange them in correct increasing order.
1. Sodium
2. Potassium
3. Copper
4. Iron
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Which of the following statements with reference to blood' is/are correct?
1. Blood is composed of plasma and different types of cells.
2. The presence of haemoglobin makes blood appear red.
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With reference to lichens, which of the following statements is/are correct?
1. Lichens are very good indicators of pollution.
2. Lichens grow well in polluted areas.
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