Urgent answer asap rick’s class plans to study the effect of eating different breakfast foods on grades in morning classes. students in the class will be the test subjects for the investigation. which of the following would most likely make the results of the experiment invalid? a)half of the students ride the bus to school, and half ride in cars. b)some students eat breakfast two hours before other students do. c)some students miss school during the investigation due to illness. d)all students in the investigation have morning classes in the same subjects.

b)Some students eat breakfast two hours before other students do.

Explanation:

The objective of the experiment was to test the effect of breakfast on the grades of students in morning classes. To perform the experiment, all students should eat breakfast at the same time so as to avoid any errors in the results. Eating breakfast at a different time would make the experiment invalid.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms