Jacques noticed that his tank mates were not as clean as they used to be. His friend Peach told him that he should try using Clean-O soap, a new
brand of soap she found at Whale-Mart. Jacques made sure to clean one tank
mate in plain water and another in water with the Clean- soap. After washing
both tank mates a total of three times, the tank mate washed in the Clean-
soap did not appear to be any cleaner than the mate washed in plain water.
a. What was the problem Jacques wanted to investigate?
b. What is the independent variable?
c. What is the dependent variable?
d. What should Jacques' conclusion be?
e. What could be a source of error in this experiment?

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above