The answer is 3. Control variables are not merely the target of the experiment but is used as a variable to compare the experimental group. This is used in order to make a reference for the experimental group.

3

The answer is 4. Without making a hypothesis, assuming that roasting could remove the organic matter could waste a lot of samples. Reading through journals about the correct way of extracting organic matter should be needed to properly conduct this experiment.

4

The independent variable is the pH of solution. It is the factor in a research wherein the researcher manipulates it in order to achieve different results. It is used to test the effect it has on the dependent variable.

The difference in light intensity of the environment can greatly affect the growth of the geranium plants after 20 days.

The control that should be used in this experiment must be a geranium plant exposed in the same environment but has a constant intensity of light.

One modification to make is to expose the plant in real atmospheric conditions wherein the color of the environment is actually seen to make it more reliable for the people that will rely in this research.

One modification to make is to expose the plant in real atmospheric conditions wherein the color of the environment is seen.

The answer is 3. Control variables are not merely the target of the experiment but is used as a variable to compare the experimental group. This is used in order to make a reference for the experimental group.

3

the answer is 3. By heating the potato, water evaporates from the tissue by then we can measure the potato barely without any water content.

3

Control variables are not merely the target of the experiment but is used as a variable to compare the experimental group. This is used in order to make a reference for the experimental group.

A serious error the student made with the design of this experiment is the lack of days of observation. There was no specific number of days of observation period.

The dependent variable in this experiment is the rats in which was exposed to the disease. A dependent variable is defined as the variable that is affected by the independent variable.

Genetically alike mice and cloned mice is an advantage for research because having the same genetic code would make the experiment more reliable. There would be no limitations in performing the experiment since they re all the same.