Assertion: gill's surface area | /r/CapableOf | volume ratio
Facets:
Source sentences:
text: Small, particularly unicellular organisms, such as bacteria and protozoa, have a high surface-area to volume ratio.
text: However, in most larger organisms, which have a small surface-area to volume ratios, specialised structures with convoluted surfaces such as gills, pulmonary alveoli and spongy mesophyll provide the large area needed for effective gas exchange.