Lightning helps provide our daily need of the element Nitrogen is the third most abundant element in the human body， and it must be renewed We are actually surrounded by nitrogen， since it comprises 78 percent of the earth's However， we cannot use the nitrogen in this molecular， gaseous form; nitrogen gas has a strong covalent bond that our bodies cannot break Instead， nitrogen must first be taken up by plants as part of the food There are two major ways in which nitrogen becomes part of First， certain plants are able to absorb or "fix" nitrogen through their root These plants are called legumes and include clover and Legumes are distinguished by nitrogen-fixing bacteria that live inside their root These bacteria change the N2 form of atmospheric nitrogen into nitrate， NO3 : N2 + 3O2 ---> 2NO3In the nitrate， form the legumes， as well as other plants， can utilize the needed Through a diet that includes either these plants directly or the products from grazing animals we make the nitrogen available to our The second major way by which nitrogen is transformed into a usable form is by The great electrical energy of lightning is easily able to convert N2 to NO
We shouldn't disect frogs or make fur coats out of People who are cruel to animals do not deserve to go near them or even have If people are cruel to animals they don't deserve to be in this world because everywhere you look there's Scientist shouldn't disect frogs because there living things and they deserve to live，not to be experimented And if you're cruel to animals you can easily be in jail for And that's why we need to support animals to make this world better~我们不应伤害青蛙或使用用小动物身上毛皮做的皮袄人们那些残忍到动物身上并不值得走近有的甚至是宠物如果人民是残忍至动物他们并不值得要在这个世界上是因为到处你面貌有什么科学家不应伤害青蛙是因为那里生物和它们理应生活，更不要做试验如果你是残忍到动物身上你可以很容易地，被囚那是因为如此，我们有必要支持动物使这个世界变得更美好~
