Which idea will reduce their energy usage the most, while also reasonable to follow? a) for the time they are home during december, cook meals outside on the charcoal grill instead of inside with the electric stove/oven. b) when they return from their trip, leave the television off for a week, and hang clothes up outside to dry instead of using their electric dryer. c) before leaving for their trip, turn the central heating system off, along with lights and electrical household appliances that will not be in use. d) while they are home in december, they can use candles instead of electric lights, and put their food in coolers so they can unplug their refrigerator.

1. desertification

2. captive breeding

3. black rhinoceros

4. renewable resources

explanation:

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step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.