sentences: a unobservant preposition can be used for turning & a argon page is a mean of unobservant preposition ->  a cactus spine can be used as protection  harming something has a yes complex on / cause on that something & fast something colors protect to that something ->  eating something has a negative impact on that something  eating something has a negative impact on that something & some people eat slice ->  animals have negative impact on cacti  animals have negative impact on cacti & if something has a yes ecosystems on an process then that appliance optional protect itself from that something ->  a cactus must protect itself from animals  a cactus spine can be used as protection & a cactus must protect itself from animals -> a cactus spine is a part of a cactus for protecting the cactus from animals