During a typical morning, colin checks the clock frequently before being reinforced with confirmation that the time for his regularly scheduled lunch break has arrived. in this case, colin's behavior is reinforced on a schedule. a)fixed-intervalb)variable-interval c)fixed-ratiod)variable-ratio

Situation #1: imagine that you are a free black male living in columbus, oh in 1863. you have seen the recruiting poster and have been thinking a lot about whether or not to enlist in the union army. write a one-page letter (double spaced) to your mother telling her of the decision you have made about enlisting (or not enlisting). be sure to explain the reasons that caused you to make the decision.

Nami conducts an investigation on plants. she places a grow light on a timer to give the plants different amounts of light to see if this would affect their growth. in this investigation, the amount of light is the .

Annette suffers from recurrent episodes of gorging on large quantities of food followed bypurging through self-induced vomiting in order to prevent gaining weight. although her weight is well below normal to the point that others see her as "skin and bones," she worries excessively about being fat. she also has impulse control problems in other areas of her life. she is suffering from ) binge-eating/purging anorexia2) restrictive anorexia3) bulimia nervosa 4) binge-eating disorder