Among these options, the one which is the broadest group used to classify organisms is D. class.
Although it is not the broadest group ever phylum and kingdom are above it), it is the broadest one here.
The term simple diffusion<span> refers to a process whereby a substance passes through a membrane without the aid of an intermediary such as a integral membrane protein. The force that drives the substance from </span>one<span> side of the membrane to the other is a concentration gradient. Hope this helps.</span>
