Identify in each of the following experiments:
independent variable
dependent variable
constants-(controlled variables)
control experiment--highlight
repeated trials/sample size
leticia timed how fast five apple slices turned brown (oxidate) after being dipped in different preservatives such as lemon juice, fruit freshener, salt water, and lime soda. another part of the experiment had the apple slices simply set out without any chemical put on them. all parts of the experiment had the apple slices in the same indoor conditions such as humidity, temperature, and lighting; also only one variety of apple-red delicious was used. she repeated this experiment 10 times.

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water