【文章內容簡介】 rtain how the minerals are changed,however,and theories vary a lot from ants licking the sand to excreting（排泄） the substance. Professor Dorn buried sand at six sites in the Catalina Mountains in Arizona,and Polo Duro Canyon in Texas,25 years five years,he measured the minerals in the sand,and discovered the ants broke down minerals up to 300 tunes faster than sand left undisturbed. Professor Dorn believes the ants collect calcium and magnesium（ 鎂） and use these elements to make the may occur when ants lick sand grains to stick them to the walls of their ,the limestone could be created from bacteria in the insects gut before it is process is similar to what39。s known as carbon sequestration（隔離） . Natural carbon sequestration is the process on Earth that manages the carbon dioxide expelled by animals and and the oceans help trap this carbon dioxide. Another method is geological sequestration where the carbon dioxide is pumped into underground chamber,or into areas full of calcium and dioxide reacts with these elements to form is this latter method that Dorn believes the ants perform naturally. But Professor Dorn claims it is still unknown how much atmospheric carbon is removed by the ants. fifth paragraph is mainly about . ants break down limestone ants use sand to kill bacteria ants decorate their nests with sand ants change minerals into limestone is the possible meaning of the underlined word expelled? out in up away to Dorn,scientists still don39。t know . A the amount of CO2 removed by ants method of ants39。 removing CO2 effect of CO2 on ants39。 survival time when ants absorb CO2 main idea of the passage is that . build their nests to keep CO2 out may remove CO2 from atmosphere are pioneers in solving global warming use limestone to absorb a great deal of CO2 D Captain John Bunch loves to go fact,Bunch loves fishing so much that he became a professional fishing guide decades ago and has remained one ever is something,however,that Bunch loves even more. That is his country and the men and women who join the army to protect since Bunch met a young soldier in 2020,who wanted to go on a fishing trip before he left the army,the Florida native has offered over 1,200 fishing trips to veterans（退伍 軍人 ） ,with all expenses paid. And Bunch39。s efforts to give back to those who have served their nation go even much by that fishing trip 11 years ago,he founded Operation Open Arms,which has since helped nearly 3:400 US troops and given out more than $12 million in direct benefits with his Open Arms also also provides free weddings, vacations,and more leisurely activities to veterans,and can rely on a work of over 300 businesses and individual partners to get former soldiers anything they might need upon returning home from army. The former marine39。s heartwarming generosity is a result of his own experiences in the military and the pride he has for his country.I do this because I love my country and I do this because America is the greatest country in the world,he told NBC39。s Today 39。s unwavering mitment goes so far that he once turned down an invitation from thenPresident Gee ,because he bad already scheduled a fishing trip with one of his the military has recognized Bunch39。s work of love,and earlier this year honored him and his anization with the Outstanding Civilian Service Award and the Army39。s most prestigious civilian award. caused John Bunch to offer free fishing trips to veterans? young soldier39。s desire to go on a fishing trip. as a professional fishing guide. served in the army. up in Florida. is Paragraph Two mainly about? . missions of Operation Open Arms. Operation Open Arms was founded. Captain John Bunch has joined. achieve