Scenario independent variable dependent variable 1. one cow is fed a growth hormone and another cow is not. after a year, both cows are weighed. 2. mosquito repellent is sprayed on one arm and the other arm is not sprayed. the number of mosquito bites is counted after 2 hours. 3. bob studies for a test and jackie does not study. after the test, they compare their scores. 4. two cars are on a track and accelerate to 60 km/h. at a certain point, both cars slam on the brakes. the distance it takes for each car to stop is then measured. 5. a group of people take a diet pill. after 3 months, they measure the amount of weight they lost. 6. ants are placed in a tray that is shaped like a t, at the end of the t, the ants can either go to a darkened area or a light area. students count how many ants end up on the dark side and how many end up on the light side. 7. one company states that it makes the best staplers. to prove it, they use the stapler to staple a thousand papers and compare it to a competitor. the competitor’s stapler jammed 3 times whereas their stapler only jammed once. 8. a doctor designs baby formula to babies gain weight. to show his formula works, he compares the weights of babies that have been using the formula to the weights of babies not on the formula. 9. cockroaches are exposed to the chemical dioxin. after 3 hours, 45/100 cockroaches are dead. 10. new houses are spayed on the outside with an insulating paint. after a year, researchers determine how much energy each house used.

The answers in regards to the Independent and dependent variable are :

        Independent Variables                               Dependent Variables 

1.       Growth hormone                                                   weight.

2.        Mosquito Repellent                                          mosquito bites.

3.         Study                                                                   Scores

4.         brakes                                                                  distance.

5.         Diet pill                                                                 weight.

6.         Tray                                                              Dark and light side

7.          Stapler                                                         Number of  jams.

8.         baby formula,                                                  weight of babies

9.         Chemical dioxin                                            45/100 cockroaches dead

10.        Paint                                                                  energy used.

An Independent variable is a variable that is not affected by the variations of other variables, it is has a Cause-effect on the dependent variable. while a dependent variable can be likened to be an effect of an independent variable ( i.e. it is determined by an independent variable ). it is also a variable measured in an experiment.  

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of those who start drinking before they're 15 will develop alcohol dependence

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.