Read the observation, question, and hypothesis. Observation: Hotter water seems to produce more bubbles than cold water when it is mixed with dish soap. Question: Does water temperature affect the amount of bubbles that are produced from dish soap? Hypothesis: Hot water produces more bubbles than cold water when it is mixed with dish soap. D'Angela will mix soap and water in a clean beaker four times. To test her hypothesis, which conditions should change or remain the same each time? The water temperature should remain the same, but the type of soap should change. The type of soap should remain the same, but the quantity of soap should change. The water temperature should remain the same, but the quantity of soap should change. The type of soap should remain the same, but the temperature of the water should change.

The type of soap should remain the same, but the temperature of the water should change.

Explanation:

According to the observation, question and hypothesis of this investigation, it can be determined that the variable being tested called INDEPENDENT VARIABLE is the temperature of the water while the effect is being measured on the amount of bubbles produced called the DEPENDENT VARIABLE.

The independent variable is the variable that the experimenter changes or manipulates in an experiment. Hence, in this case, the temperature of the water should change. On the other hand, the variable that should remain the same or constant is called CONSTANT VARIABLE. In this experiment, the type of soap used should remain the same so as not to affect the outcome of the experiment.

a. possible errors

d. new questions

explanation:

predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.