The Most Plausible Hypothesis to Explain Why Species Richness Is

question 55

Multiple Choice

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

• A) tropical communities are younger.
• B) tropical regions generally have more available water and higher levels of solar radiation.
• C) higher temperatures cause more rapid speciation.
• D) diversity increases as evapotranspiration decreases.
• E) tropical regions have very high rates of immigration and very low rates of extinction.

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Definitions:

Depressants

A class of drugs that reduce neural activity and slow down the functions of the body, often used to induce calmness or sleep.

Agonist

A chemical or drug that binds to receptors in the brain and causes an action or response, often mimicking the effects of naturally occurring substances.

Neurotransmitter

Chemical substances that transmit signals across a synapse from one neuron to another.

Freud

Sigmund Freud, an Austrian neurologist best known for developing psychoanalysis, a method through which an analyst unpacks unconscious conflicts based on the free associations, dreams, and fantasies of the patient.