Question on: JAMB Biology - 2022
Gaseous exchange in annelids is more advanced and efficient compared to flatworms because?
the cells of their epidermis have no blood capillaries
they have well developed respiratory structures
their cylindrical shape gives high surface area to volume ratio
their surface area to volume ratio is very low
The correct answer is Option C
Cnidarians and flatworms, which are simple organisms, have every cell in their body located near the external environment
Their cells are kept moist, and direct diffusion allows gases to spread out quickly. Flatworms are tiny, flat worms that "breathe" literally by diffusing fluid across their outer membrane.
Annelids possess a closed circulatory system where blood remains entirely contained in vessels.
Although many species of annelids have simple gills, they do not have lungs.
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