Which phrase describes a keystone species?

A for you'res but for mine the answer was

Its absence would affect many organisms in the community

answer; the correct answer is conflict- related aggression; +

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.