1. michael put 100 red seeds, 100 brown seeds, and 100 yellow seeds in his bird feeder. he also put in his bird feeder 100 sunflower seeds that the birds normally eat in their diet. he counted the number seeds of each color that remained after 2 days. he repeated this experiment 10 times over a 20 day period. he kept the bird feeder in the same place and thoroughly mixed the seeds together.
identify in each of the following experiments:
independent variable
dependent variable
constants-(controlled variables)
control experiment--highlight
repeated trials/sample size

Independent variable: color of the seed

Dependent variable: Number of seeds eaten

Constants: Number of seeds, location, feeder

Control experiment - Sunflower seeds that birds normally eat in their diet

Repeated trials: 10 times

Explanation:

The independent variable is the variable that is changed throughout the experiment. It is set to determine whether the changes made to it would have an effect on what is being tested.

The dependent variable is what does not change. The change it undergoes is not done by the experimenter, instead the change noted (if any) would be because of the independent variable.

Constants or controlled variables are variables that is set the same in all groups. This enables the researcher to rule out or prevent intervening variables or variables that may cause a change on the dependent variable. This way, the researcher would be able to determine whether it is indeed the independent variable that caused any variation or change.

Control group or control experiment is the group where the independent variable is not applied. This is to determine also whether it is the independent variable that made any change and it can also serve as a baseline for the experiment for comparison whether change (if any) is significant.

When it comes to experiments, repeated trials will help validate whether the results are consistent or just a fluke. It is a good characteristic of an experimental design because the scientific method requires that the experiment be repeatable for validation.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

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