Fish ___ oxygen through their gills(鳃). III.单项填空: () 1. Air pollution can affect humans by___ sore eyes and respiratory problems, especially in children and___. A. cause, the old B. causing, the older C. causing, the elderly D. cause, the elderly ()...
D Only human tears can discharge certain chemicals. 第1题 A He will tell Mary how to operate the dishwasher. B He will wash the dishes himself instead. C He will help Bill to translate the manual. D He himself will operate the dishwasher. [正确答案]:B [本题分数]:1.0分 [答案解析] ...
Nitrogen and oxygen are two gases that make up the majority of Earth’s atmosphere, and they appear in Mercury’s as well. The abundance of nitrogen is 2.7 percent of Mercury’s air, and oxygen accounts for 0.13 percent. On Earth, plants are responsible for the production of oxygen. The ...
Making up almost 21 percent of the air all living things breathe, oxygen is absorbed by the lungs, or lung-like structures in lower animals, and transported to all cells in the body by the blood. Oxygen is the most unstable, and therefore the most chemically active, gas found in air. A...
What are the classifications of chemicals? Which chemical element has the shortest name? What is the chemical formula for oxygen? What is nomenclature in organic chemistry? What is the proper chemical name for bicarbonate of soda? What is the Iupac name of this molecule?
What are the chemical properties of oxygen? What are some physical properties of einsteinium? What is the empirical formula of benzene? What are aromatic compounds? What are the properties of noble gases? Which characteristic of a substance is considered a chemical property?
Mark knowledge Chinese name: Cesium hydroxide English name: cesium hydroxide monohydrate Hazard category: Category 8.2 Alkaline corrosives Molecular ..
College?sSchoolofHealthSciences.“Asthesechemicalsdrop,thebodyrespondsbyincreasing levelsofcortisol,thehormonereleasedinsituationswherewefacethreat.”Theresultcanbean increasedanxiety,difficultysleepinganddepression. Butit?snotjustincreasingdarknessthatcantriggerthesesymptoms.Forpeoplewhofeelthis wayeveryyear,someofthe...
Finally, we can seek chances to plant trees,which can absorb carbon dioxide and give out oxygen. In brief, what should be advocated is that we should live a low-carbon life and take actions to conserve the environment. 16. 过低碳生活 ...
A chemical change occurs when two or more substances are combined, atoms are rearranged, and a new substance is formed. For example, when you combine hydrogen and oxygen in the correct amounts, water results. Answer and Explanation: Become a Study.com member to unlock this answer!Create your...