Phoebe is taking samples from a lake to determine how the populations of aquatic life change during the summer. each week for a month she takes samples from different areas of the lake. over the course of a month, she finds the marine life listed in the chart below. what should phoebe change about her methodology to better address her question? week 1 location 1 week 2 location 2 week 3 location 3 week 4 location 4 insects 13 20 18 15 crawfish 8 15 20 22 fish 3 11 13 12 other 5 2 8 4

B.) Take samples from the same location each time.

Explanation:

The original answer choices to this question are the following:

Phoebe should take samples from the same location, rather than four different locations. This will overall give her more accurate and reliable results. Some areas of the lake will have more or less wildlife depending on what predators and prey live. She must have a control variable in this survey, otherwise her data will not be correct.

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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.