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sci 10 exam review b.. - hrsbstaff.ednet.ns.ca
sci 10 exam review b.. - hrsbstaff.ednet.ns.ca

... 49. Draw an electron dot diagram for Mg. 50. What ion will K form? 51. What ion will Mg form? 52. What ion will Br form? 53. What ion will Al form? 54. What ion will S form? 55. Will He form an ion? Why or why not? 56. Will Xe form an ion? Why or why not? 57. Will Ca form a cation or anion? 58. Will ...
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No Slide Title

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... found in DNA, RNA, proteins and ATP. Nitrogen atoms must be used over and over again so that new molecules can be made and used by all living things. In the atmosphere, nitrogen gas is the most abundant gas. Plants and animals cannot use nitrogen gas, but certain bacteria can change it into a usable ...
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Science Chapter 7 Notes - msgreenshomepage
Science Chapter 7 Notes - msgreenshomepage

... dioxide when they breakdown wastes in the environment. 3. Oxygen Cycle: a. Producers release oxygen as a byproduct of photosynthesis. ...
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Nitrogen cycle



The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is nitrogen, making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.
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