In One Study,rats Licked Frequently During Infancy by Their Mothers

question 3

Multiple Choice

In one study,rats licked frequently during infancy by their mothers were calmer than rats licked infrequently when faced with stress later in life.What is the most likely explanation for this?

• A)The rat pups that were frequently licked learned to engage in the licking behavior as a coping strategy during times of stress.
• B)Because mothers who chose to lick their pups had a calmer demeanor,their pups were raised in less stressful environments.
• C)By licking their pups,these mothers had influenced the expression of genes that influenced responses to a stress hormone.
• D)The "licking" prone mothers only cared for the calmest pups of the litter,causing the more aggressive pups to die prematurely.

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Definitions:

Timing Belt

A belt that synchronizes the rotation of the engine's crankshaft and camshaft, ensuring that the valves open and close at correct intervals.

Relative Compression Test

A quick way to identify a weak cylinder by cranking the engine with an inductive ammeter on the starter circuit. With a lab scope, cranking amperage can be graphed and correlated to a particular cylinder. A cylinder with low compression will draw fewer amps than a cylinder with higher compression, which will show on the graph.

Inductive Ammeter

An instrument used for measuring electrical current without the need to make direct contact with the conductor.

Black Smoke

Emission from a vehicle's exhaust, indicating incomplete combustion and the presence of excess fuel in the engine.