The Experiments with Rats Living in Highly Crowded Cages Suggest

question 3

Multiple Choice

The experiments with rats living in highly crowded cages suggest that

• A) overcrowding leads to changes in social behavior among rats.
• B) overcrowding leads to short life spans for most rats in crowded conditions.
• C) rats become more fertile, thus leading to even more crowded conditions.
• D) crowding eventually reduces the population to about a tenth of its original size.

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Definitions:

Output Field Devices

Devices that receive electrical signals from a control system and perform actions, such as valves, lights, or motors.

Output Module

A component of a PLC or other control system that provides the interface for output signals to external devices or equipments.

Input Module

A component in programmable controllers or computers that receives and processes input signals from sensors or other devices.

Ladder Program

A graphical programming language resembling a ladder used for programming PLCs, where the vertical lines represent the power supply and each rung represents a rule executed by the PLC.