increase in an plant gravity can effect that plant to be extinct
gravity is force_of_nature. extinction is death. gravity has not effect_of_pulling_things_down many_plant_species is becoming_extinct. gravity is what_keeps_things_on_earth. increase_in_mass is not increase_event. increase_in_mass is increase_event. gravity has effect_of_pulling_things_down gravity is not force. gravity is not force_of_nature.