Question

review & reflect... the nature of science essential outcomes i can describe the steps of the scientific method. i can identify variables in a scientific investigation. i can explain the difference between science and pseudoscience. i can analyze & draw appropriate conclusions from a table and graph. quick review lets review the scientific method—by working backwards! below is a graph showing the heart rate of daphnia (tiny, see - through crustaceans) exposed to different water temperatures. their transparent bodies make it easy to observe & count heartbeats under a microscope. start with the conclusion & work your way back to the beginning of the scientific method. fill in each step using the information provided in the graph. 8. share & repeat 7. draw a conclusion as the temperature _, the number of heart beats _, suggesting they _. 6. analyzing data is this data qualitative or quantitative? heart rate (bpm) 0°c _°c _°c _°c 5. test with experiment independent variable: dependent variable: control group: constant variables (2): 4. form a hypothesis if then because they depend on external heat sources for their metabolism (they are cold - blooded or ectothermic). 3. do some research 2. ask a question

Explanation:

Step1: Analyze the graph

The graph shows a positive - linear relationship between water temperature and the heart rate of Daphnia.

Step2: Fill in conclusion

As the temperature increases, the number of heart beats increases, suggesting they are more active.

Step3: Determine data type

The data on heart rate (in beats per minute) and temperature (in °C) is numerical, so it is quantitative.

Step4: Identify variables

Independent Variable: Water temperature. Dependent Variable: Heart rate of Daphnia. Control Group: Not specified in the problem (could be Daphnia in a standard - temperature environment). Constant Variables (2): Type of Daphnia, same microscope for observation.

Step5: Form hypothesis

If the water temperature increases, then the heart rate of Daphnia will increase because they depend on external heat sources for their metabolism (they are cold - blooded or ectothermic).

Step6: Ask a question

How does water temperature affect the heart rate of Daphnia?

Step7: Do some research

Research could involve looking up previous studies on Daphnia physiology and the effect of temperature on ectothermic organisms.

Step8: Share & Repeat

Share the results with the scientific community and repeat the experiment to verify the findings.

Answer:

1. Increases; increases; are more active
2. Quantitative; Heart Rate (bpm) values for 0°C, 10°C, 20°C, 30°C (from the graph: 0, 40, 60, 100 respectively)
3. Independent Variable: Water temperature; Dependent Variable: Heart rate of Daphnia; Control Group: Not specified (could be Daphnia in a standard - temperature environment); Constant Variables: Type of Daphnia, same microscope for observation
4. If the water temperature increases, then the heart rate of Daphnia will increase
5. How does water temperature affect the heart rate of Daphnia?