1 - trachea, 2 - smallest of blood vessels, tissue fluid formed here, 3 - Hybridisation, 4 - The grouping of species into distinct groups, 5 - spiracle, 6 - the process of water movement and gas exchange in a plant, 7 - globular protein that combines with oxygen, 8 - stomata, 9 - Classification, 10 - Diversity, 11 - opening on the suface of an insect for gas exchange, 12 - part of the stem that carries the water, 13 - countercurrent, 14 - part of the human gas exchange system, 15 - xylem, 16 - A way of using DNA to check relationship between species, 17 - alveoli, 18 - variety of 'things' in one area, 19 - internal network of tubes in insects, 20 - haemoglobin, 21 - pore, mostly in lower epidermis of a leaf, 22 - two substances flow opposite to maintain conc grad, 23 - capillary, 24 - transpiration,

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