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A negative reinforcement procedure in which the onset of a stimulus or event following behavior is prevented and the rate of response increases.

Any event or stimulus that increases the probability (rate of occurrence) of an operant when it is removed (or prevented).

Many veterinarians recommend that healthy geriatric small animals (those over [answer1] years of age) should be examined [answer2] time(s) a year.

Define reinforcement. 

An aircraft prototype is placed in a wind tunnel to test its aerodynamic performance by Boeing. The pressure and temperature of the wind tunnel are 7500 Pa and 355 K, respectively. The total pressure on a point of the prototype is 12500 Pa. What is the local Mach number at this point? 

Microglia are resident glial cells of the brain

Bulk herbs are most commonly used for herbivores.

In the underwater treadmill, the most resistance with the least buoyancy is achieved when the water is at the level of the shoulder.

Similar to drugs, some herbs have a low margin of safety.

The main advantage of using herbal supplements is that, unlike drugs, they are safe and do not cause side effects.