Platyhelminthes, like the flatworm seen here, do not have a respiratory system. All but one of the statements explains why this is possible. That is they?

A) are anaerobic organisms.
Eliminate
B) live in a moist/aquatic environment.
C) have a high surface area:volume ratio.
D) have a thin body that facilitates diffusion throughout.

Answer 1

Platyhelminthes (notable classes cestode and trematode) live inside the specific part of the gut,from there they receive their readymade nutritive substances by the sucker/hook,so they don't need to breathe #O_2#,hence they use anaerobic respiration.

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Answer 2

Isabella Anderson

"They absorb oxygen directly through their skin" is a statement that fails to provide an explanation for how Platyhelminthes can survive in the absence of a respiratory system.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

Platyhelminthes, like the flatworm seen here, do not have a respiratory system. All but one of the statements explains why this is possible. That is they?

A) are anaerobic organisms. Eliminate B) live in a moist/aquatic environment. C) have a high surface area:volume ratio. D) have a thin body that facilitates diffusion throughout.

A) are anaerobic organisms.
Eliminate
B) live in a moist/aquatic environment.
C) have a high surface area:volume ratio.
D) have a thin body that facilitates diffusion throughout.