During a typical morning, Colin checks the clock frequently (frequency of time) 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."

fixed-interval    

Explanation:

Fixed-interval schedule is considered as one of the four distinct types of reinforcement schedule in the operant conditioning theory which was introduced by B. F. Skinner. A fixed-interval schedule is referred to as a reinforcement schedule whereby the very first or initial response is being rewarded once a 'specified time amount' has been passed or elapsed.

In this case, Colin's behavior is reinforced on a fixed-interval schedule.

texas governor sam houston opposed secession, but was unable to prevent it. in this speech, given prior to lincoln's election, he presents the argument that slavery would be safer within the united states than outside of it. it was a prescient argument, and one held by several other southern leaders.

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conformal maps greatly distort _sizes_ of continents in higher latitudes.

the answer is sizes.