which of the following features do all gas exchange systems have in common?

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which of the following features do all gas exchange systems have in common?

a)the exchange surfaces are moist
b)they are enclosed within ribs
c)they're maintained at constant temperature
d)they are exposed to air
e)they have small surfce areas

choose one?

2007-04-02 02:10:27 · 3 answers · asked by caitie 2 in Environment

3 answers

c
As far as I know are the others not 'mandatory'.

2007-04-02 02:19:12 · answer #1 · answered by Puppy Zwolle 7 · 0⤊ 0⤋

If you mean heat exchange, then none of the above.
I can't choose one that is common to all systems.

2007-04-02 09:26:28 · answer #2 · answered by Neil S 4 · 0⤊ 0⤋

they have small surface areas

2007-04-05 09:42:26 · answer #3 · answered by unpergirl 1 · 0⤊ 0⤋