OE


The contrast for this word is between the action of the single-celled organisms that obtain nutrients directly, and the more complex organisms that have structures for obtaining and breaking down food sources. To osmose is acquire gradually and unconsciously, without effort. This concept directly contrasts the processes of multi-celled organisms. Thus option A is the best choice for the blank. Exude refers to output, not intake, and is not applicable. Cull is to select or choose. While the passage indicates that multi-cell organisms may select food sources, that point is not made about single-celled organisms.
To extract nutrients multi-cell organisms dissolve or melt the food source. Deliquesce means to melt or dissolve. Flux is a general term for melting, but doesn't apply to liquefying elements. Coagulate is an antonym meaning to join elements of a liquid into a solid or semi-liquid.