Biology - Prime Time - 09/09

Sarah wants to know which brand of nail polish last the longest without chipping. She buys 4 types of nail polish - Essie (which she normally uses), Butter, OPI, and Sally Hansen. Every Sunday for 4 weeks she paints her nails with a different brand of polish and records how many days she lasts before she gets her first chip. She makes sure to use the same bottom coat and top coat with each type of polish, and she makes sure to do the same weekly routine each week so that her nails aren't getting treated more roughly different weeks.

Find the following: Independent variable, dependent variable, hypothesis, control group, experimental group, and constants (at least 2)

Identify the independent and dependent variables for the following:

1) If three plants are each placed under different lights (red, green, and blue), then the plant under the green light will grow the most and the plant under the blue light will grow the least.

2) If water from a river is sampled upstream and downstream from the sewage treatment plant, then the level of toxins will be higher in the downstream sample.