Answer:
concurrent schedule
Explanation:
Based on the scenario being described within the question it can be said that Lever pressing is on a concurrent schedule. This refers to a schedule of reinforcement in which the reinforcements are offered to the subject or participant at the same time for their choice. Which in this case since both levers are offered to the rat at the same time it can be considered concurrent reinforcement scheduling.
Its the last one the answer is D
Answer:
Each year, over 1.6 billion tons of soil flows into the Yellow River, which causes the continual rise and shift of the riverbed. Before damming, it was extremely prone to flooding, and had caused millions of deaths, including the deadliest disaster in human history. sorry that its long
Explanation: