MrDocherty,78,who Lives Alone,frequently Complains of Being Cold Even with a Room

question 16

Multiple Choice

Mr.Docherty,78,who lives alone,frequently complains of being cold even with a room temperature of 20°C.How can this be explained?

• A)Mr.Docherty has become confused and thinks it is colder than it really is.
• B)He is probably feeling lonely and wants some attention.
• C)There may be a malfunction of the heat-regulating mechanism in his brain.
• D)Mr.Docherty has lost subcutaneous fat and muscle tissue as he aged.

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Definitions:

Allopatric Speciation

The evolution of new species after populations have been separated geographically, preventing gene flow between them.

Sympatric Speciation

The evolution of new species within a contiguous population that still has extensive gene flow.

Gametic Isolation

A type of prezygotic barrier where the gametes (egg and sperm) of two different species fail to unite or fertilize, preventing the formation of a zygote.

Hybrid Inviability

A postzygotic barrier where offspring resulting from the mating of two different species fail to survive to reproductive maturity.