Analyze Ecosystem Change Data Practice Test

Ecosystem changes can affect populations. A desert area had a baseline condition in Years 1–2. In Year 3, several wetter-than-usual seasons occurred (changed condition), increasing plant growth. Use the data to answer: Which prediction about future population change is supported by the trend in the data?

Data:

• Plant cover (%): 15, 16, 30, 38, 36 (Years 1–5)
• Kangaroo rats (count): 40, 42, 55, 70, 68 (Years 1–5)
• Hawks (count): 6, 6, 7, 9, 9 (Years 1–5)

Ecosystem changes can affect populations. A pond was measured for 5 years. Years 1–2 are the baseline condition (no fertilizer runoff). Starting in Year 3, fertilizer runoff increased algae growth (changed condition). Use the data to answer: Which conclusion is supported by the data and evidence?

Data (average counts per survey):

• Algae coverage (%): Year 1 = 10, Year 2 = 12, Year 3 = 40, Year 4 = 55, Year 5 = 50
• Minnows (fish): Year 1 = 120, Year 2 = 115, Year 3 = 90, Year 4 = 60, Year 5 = 65
• Dragonfly nymphs: Year 1 = 30, Year 2 = 28, Year 3 = 26, Year 4 = 20, Year 5 = 22