how do humans impact the nitrogen cycle
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Answers:You could point out that we have an impact on everything around us. You could as them to think about how we affect plants ie, cut them down for paper, medicines etc. We use pesticides etc which may kill off any type of plant life living nearby. This should lead onto a discussion about "if we do x, what happens to y?" Good luck!
Answers:The biggest physical property of water and its importance to life is its polar nature and hydrogen bonding. Because water is a polar molecule, it creates weak bonds between the slightly negative O of one water molecule and the slightly positive H's of another water molecule. These are known as hydrogen bonds. In transpiration, this means that when one water molecule evaporates, it pulls the next one behind it up to the leaf. And this one pulls the one behind it, and the one behind it, so on, so forth. In endotherms, this hydrogen bonding increases the amount of heat energy that water can absorb (also known as specific heat) before changing temperature. Heat energy must be put into water to break these hydrogen bonds before the temperature of water will change (in addition, it must release a lot of heat to cool). In other words, it stabilizes the temperature of endotherms. It also is useful in this regard for sweating, as you can release a lot of heat. For plasma membrane structure, the polar nature of water shows up again. Plasma membranes are made of phospholipids which are polar on one side, but nonpolar on the other side. The nonpolar side is repelled from the water (hydrophobic) and the polar side is attracted to the water (hydrophilic). If you get a long chain of phospholipids, they will encircle into a single membrane known as a micelle. If you get a double layer of phospholipids, you will get a standard cell membrane. Human activity plays a part in the water cycle. Growing more plants increases transpiration rates, shipping water into desert regions releases more water in those areas. Human bodies sweat, releasing water via evaporation. There are more examples, but these are just a few easy ones.
Answers:You also have to test for ammonia. If you cycle with fish in, you will need to do a partial water change when ammonia rises above 1.0 on your test. Higher levels will damage your fish's health. After the ammonia levels peak and begin to go down, then nitrite will rise. Whenever it is above 1.0, you should do a partial water change to safeguard your fish's health. When it has peaked and started downward, the nitrates will begin to rise. When you read zero ammonia, zero nitrites, and some nitrates, your tank is cycled. Then you can add a few fish every couple of weeks until your tank is stocked. After that it is important to test for nitrates and strive to keep them under 20. This will require partial water changes every week or so. Also, you should google 'fishless cycle' to get info on a better method of cycling your tank. www.myfishtank.net is a really great place to learn about fishkeeping.