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
Explanation
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They have an efficient respiratory structure
Explanation: Gaseous exchange in annelids (like earthworms) occurs through their moist skin, which is richly supplied with blood vessels — making it a more efficient respiratory structure than what is found in flatworms, which rely mainly on diffusion across their body surface.
While surface area to volume ratio is important, flatworms (being flat) actually have a higher surface area to volume ratio than cylindrical annelids, not the other way around
B. they have well developed respiratory structures
Annelids have well-developed respiratory structures, such as gills or a network of blood vessels close to the surface of the body, which facilitate efficient gas exchange.
THE SELECTED ANSWER IS WRONG
compare to flatworms annelids have well developed respiratory surfaces
And it can never be C because compare to flatworms annelids have small surface area to volume ratio
So the best Option to pick is B
