> You mean than ? "Different to", or "different from", never "different than". > forms ? "Plankton" is a collective noun and takes the plural, except when a

> You mean than ? "Different to", or "different from", never "different than". > forms ? "Plankton" is a collective noun and takes the plural, except when a single individual is being referred to. Like sheep. The article is written with good grammar. BTW, it's "usually", not "usualy".