<p>in this first episode a real human person talks about why gas exchange systems are needed by many organisms.</p>

in this first episode a real human person talks about why gas exchange systems are needed by many organisms.

Y1E1: the need for specialised exchange surfaces

Audio version of my new series of A level biology YouTube videos covering the new (2015) specification. I discuss familiar concepts in-depth, in the hope that a better understanding will make it easier to learn and make you a Jedi master of the subject.

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Y1E1: the need for specialised exchange surfaces

Y1E1: the need for specialised exchange surfaces