Un sistema planetario está formado por un conjunto de planetas que orbitan alrededor de una o más estrellas, nosotros giramos en torno al sol, nuestro sistema planetario se llama: a)Sistema solar
b)Aquarius
c)Gliese 876
d)Vía láctea

Which of the following is an example of negative reinforcement? a.marty knocks over his mother's prize fern so she gives him a time out. b.gwen mows the lawn and her dad takes her out for ice cream. c.tara takes an aspirin, and her headache begins to go away. d. peter comes in late from his lunch and is fired from his job.

How much wood would a wood chuck wood if a wood chuck could chuck wood

During the industrial revolution in europe, were recruited to locate criminals. sheriffs police bobbies thief catchers