The respiratory surface needs to be:-
1.Thin
2.Moist
3.Permeable.
4.Large surface area.
1.Thin
2.Moist
3.Permeable.
4.Large surface area.
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Refer to this site: http://webcache.googleusercontent.com/search?q=cache:QVjBAyFW62kJ:www.biog1105-1106.org/demos/105/unit6/gasexchange.10.html+requirements+for+gas+exchange&cd=2&hl=en&ct=clnk&source=www.google.com so you will know.