biology question :(

[tiger~torah]

question tht i dont kno an answer to is:

can you give an example of an organism which has an external gas exchange surface?

any help would be appreciated :)

[Jugglering]

A fish would be an example - its gills are considered to be external - here's a link

http://books.google.co.uk/books?id=6QfG9Yx9PkA C&pg=PA35&lpg=PA35&dq=organism+with+external+g as+exchange+surface&source=web&ots=_u-0sIbggV& sig=xuMpCOIm9RPta6bizabjrxbYBD0&hl=en&sa=X&oi= book_result&resnum=5&ct=result

[dundurn]

Amphibians. The reason they prefer to have a moist skin is because they use it as an external 'lung'.