True or false in a scientific experiment, the one variable that is purposely changed to test a hypothesis is called the manipulated variable.

True

Explanation:

An experiment has two types of variables: independent and dependent variables. The independent variable or the manipulated variable is the one that is changed during the experiment to observe the effect of the changes on the dependent variable. The dependent variable is also called as responding variable as it changes in response to alteration in manipulated variable.

segmentation=endoskeleton=backbone=coelom=tissues