QUESTION !!!!!!!!!???

Biology
Tutor: None Selected Time limit: 1 Day

Both aquatic and terrestrial organisms must have ____ across which gas exchange can take place.

a.tracheal tubes

b.stratified squamous epithelial tissue

c. respiratory system

d.gills and lungs

e. moist surface

May 10th, 2015

c. respiratory system

....................................................................................................................

May 10th, 2015

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