Environmental science students were on a field trip and visited a site where they saw pioneer species. Which of the following were the students most likely to encounter? A) animals introduced in a place where no such species like that had been there before B) plants that were planted in a land that had not been cultivated before C) floating water weeds D) species of plants that inhabit a place before other plants are discovered E) species, like algae or fungus, that establish themselves in an environment without soil