Which is the independent variable in this experiment?

Which is the dependent variable in this experiment?

Which is a controlled variable in this experiment?

Answer/Explanation:

The experiment being referred to is missing in the question. However, the different types of variables (controlled, independent, and dependent variable) that is found in a typical scientific experiment can be easily identified.

Let use an hypothetical experiment to expound more on this. For example, we want to carry out an experiment to find out how different types of light affects plant growth. The variables involved could be:

1. Independent Variable: light would be the independent variable since it is not dependent on any other factors, and it is the variable that affects plant growth. This could be manipulated of changed in the experiment by using different colored lights to see the effect they each has on plant growth.

2. Depedent Variable: Growth in this experiment is the dependent variable, as any change in the independent variable brings a change in the plant growth being measured here. Growth is dependent on light.

3. Controlled variable: controlled variable in the hypothetical experiment could be temperature here. This type of variable is the variable that is kept constant for all through the experiment. I.e. in testing how the different light affects plant growth, we would try to control the temperature to be the same for each type of colored light being used in the experiment.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!