Why does diffusion alone suffice to supply oxygen in both protists (protozoans) and flatworms?

Diffusion alone is sufficient to supply oxygen in protists (protozoans) and flatworms due to their small size _____ _______ __________ ___ ________.
___ _______ _______ ________ _____.
________ ___ __________ ___ _______ _________ ________.
___ ___ _________ ______ _________ ______.
___ ______ ____ ___ _____ _________ __________ _____ ________ ___ ___ _________.
__________ __________ ___ _____ ___ ________ ____.
________ _________ _________ ______ ________ _______ _______ _____ _______ ____.
________ ______ _________ ______ ______ ____ ________ ________ ________ ___ ___ ________.
_______ __________ _________ ______ _________ _______ _____ _____.
________ _______ _______ _____ _____ _________ ________ _____ ___ ______ ___.
________ _________ _________ ________.
Get Full Answer on WhatsApp