Answer;
D. controlled
An experiment in which only one variable is changed is a controlled experiment.
Explanation;
-A control experiment is an experiment where the researcher only changes one variable at a time in order to isolate the results.
In a controlled experiment, most conditions are constrained so that they do not change. One or two other conditions are then changed and measured by the experimenter. These are known as the independent variables.
For example; An experiment where all subjects involved in the experiment are treated exactly the same except for one deviation.
D. Asteroids vary greatly in size and are mostly made up stone, iron and nickel
Is A because it’s not a prediction it’s proven and not explaining anything nor is it a claim.
Student 3 correctly separate organisms into these 2 kingdoms
