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Biology a level help!!!!

I feel really silly because for some reason i can't seem to understand how to answer this question.

1. (a) A thin surface and a diffusion gradient are both features of gas exchange surfaces. Describe how these are achieved at the gas exchange surfaces of

(i) a mammal ( 3 marks)

(ii) a leaf (3 marks)
Sorry you've not had any responses about this. :frown: Are you sure you've posted in the right place? :smile: Here's a link to our subject forum which should help get you more responses if you post there. :redface:

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