Question

zebra fish study on circadian rhythm

1. professor cao has conducted a study on zebra fish and circadian rhythm. based on your reading, write a hypothesis.
2. identify the independent variable.
3. identify the dependent variable.
4. what type of quantitative data do you assume was collected?
5. only one controlled variable is listed, what is it?

same species (same egg/embryos)

Explanation:

Step1: Hypothesis

Zebra fish activity patterns are influenced by light - dark cycles which are related to circadian rhythm.

Step2: Independent variable

The light - dark cycle (photoperiod) is the factor that can be manipulated and is likely to affect the fish's circadian rhythm.

Step3: Dependent variable

The activity level or behavior patterns of zebra fish, which are expected to change in response to the independent variable.

Step4: Quantitative data type

The number of movements or swimming distances of zebra fish over a specific time period could be collected as quantitative data.

Step5: Controlled variable

The species of the fish (zebra fish) is a controlled variable as mentioned in the note (same species, same egg - embryos).

Answer:

1. Zebra fish activity patterns are influenced by light - dark cycles which are related to circadian rhythm.
2. Light - dark cycle (photoperiod)
3. Activity level or behavior patterns of zebra fish
4. Number of movements or swimming distances of zebra fish over a specific time period
5. The species of the fish (zebra fish)