Which of the following is an example of a fixed interval reinforcement schedule?

Aluminum is used to make cans for the beverage industry. which other industries is aluminum important

We're always up for a good laugh, but, seriously, refrain from posting silly or answers. keep the quality of high by following the rules and posting thoughtful answers.

Poland had achieved self government and can enjoy its since the collapse of the soviet union a: autonomy b: ingenuity c: feminismd: genocide