Biology

In a controlled experiment, constants are:

Variables that are kept the same.

These are the factors that are not changed during the experiment, ensuring that they do not affect the outcome. Keeping certain variables constant helps isolate the relationship between the independent variable (the one you change) and the dependent variable (the one you measure), so you can be sure that any changes in the dependent variable are due to the independent variable and not some other factor.

For example, in an experiment testing how light affects plant growth:

C...