sentences: increase in an plant gravity can effect that plant to be extinct
docs: gravity has effect_of_pulling_things_down many_plant_species is becoming_extinct. gravity is force_of_nature. extinction is death. evolution has effect_of_creating_new_species increase_in_mass is increase_event. vegetation has profound_effect_on_microclimate gravity is what_keeps_things_on_earth. gradual_accumulation is increase_event. extinction is physical_destruction_event.