Mr. Mandarich wanted to see if the color of light shined on a plant had an effect on the number of leaves it had. He gathered a group of the same species of plants, gave them the same amount of water, and did the test for the same amount of time. Only the color of light was changed. What is the independent variable?

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

They are all full and don't need any more electrons in there outer shell.

The answer is b because a,c,and d are opinons