Identify the dependent variable for the following hypothesis: An increase in the average temperature of the Earth’s atmosphere will cause a reduction in the size of the polar ice caps. A. Size of the polar ice caps
B. Average temperature of Earth’s atmosphere
C. Rate ice melt
D. Amount of fossil fuels burned
I think this answer is simple but I'm a bit confused

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

the sphincter muscles at the end of the digestive tract is the anus.