Juan propped up a graham cracker in a shallow bowl. he than set up an electric fan to blow on the graham cracker at three different speeds. what is juan’s independent variable in this experiment?

The answer would be:

B. The speed of the electric fan.

This is because:

An independent variable is what influences changes in the dependent variable. So you can say that it is the variable that we chance. It is called INDEPENDENT because it is not affected by the dependent variable.

In this case, the speed of the electric fan is not affected by the graham cracker, but the speed of the electric fan AFFECTS the graham cracker.

(Although the biggest clue is the variable that is manipulated or changed by the experimenter.)

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.