grass is a kind of green plant & a shrub is a kind of plant ->  grass and shrubs are kinds of plants  grass and shrubs are kinds of plants & green plants are a kind of producer ->  grass and shrubs are kinds of producers  a source of something produces that something & if something is eliminated then the amount of that something decreases ->  if a source of something is eliminated then the amount of that something that is produced decreases  if a source of something is eliminated then the amount of that something that is produced decreases & a producer is a source of food energy in an ecosystem ->  if a producer is eliminated then the amount of food energy produced in an ecosystem decreases  grass and shrubs are kinds of producers & if a producer is eliminated then the amount of food energy produced in an ecosystem decreases ->  if grass and shrubs are eliminated then the amount of food energy produced in that ecosystem decreases  if grass and shrubs are eliminated then the amount of food energy produced in that ecosystem decreases & removing something is a kind of method for eliminating something -> if grass and shrubs are removed then the amount of food energy produced in that ecosystem decreases