Maya's father told her that hummingbirds like to drink the nectar from red flowers. maya noticed that most of the hummingbird feeders in the store were made of red plastic. she wondered if this were really true. she decided to conduct an experiment to see if hummingbirds really preferred red flowers to other colors. maya hung three bottles, upside-down, in her garden. one was red, one was green, and the last one was clear. she filled the bottles with the same sugar solution and screwed a drip nozzle into each one. then she waited and watched. what is the independent variable in this experiment? a) the color of the feeder b) the location of the bottles c) the amount of sugar solution d) how much the hummingbirds ate