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how do humans impact the nitrogen cycle

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Question:It's year 11. they've created posters on the nitrogen, water, and carbon-oxygen cycle. this lesson they need to learn about the impact of humans on these cycles and our impact on the ecosystem in general. After this, i just need to do some revision with them on photosynthesis and respirations and their equations. It's a 65minute lesson - any student centred ideas to make this better than a discussion or question and answer session?

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!

Question:

Answers:They don't.

Question:how do the physical properties of water contribute to transpiration, thermoregulation in endotherms,and plasma membrane structure.... also wat is the impact of a human activity in the water cycle?

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.

Question:recently set up a 55 gallon tank. I have washed all the decors, gravel, etc. My filter is working and so is my heater to 78 degrees F. I left this for a day and the temperature is right at 78 and the ph level read 6.5 and the nitrate and nitrites are at the safe zone, 0. I am planning on raising the ph level to about 7-7.5 to meet the requirements for a tropical community. So, now time for the fish..... I'm not sure how the cycle works but I heard about a starter fish? So, should I get maybe about 3 fish to get it going? Please explain the cycle please THANKS =D

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.