Which of the Following Is a Causal Factor in Some

question 117

Multiple Choice

Which of the following is a causal factor in some cases of insomnia?

• A) sleeping pills
• B) sleep apnea
• C) nocturnal myoclonus
• D) restless legs
• E) all of the above

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Definitions:

Organic Material

Material that is derived from living organisms, including plants, animals, and their by-products, which is capable of decomposition by microorganisms.

Soil Horizon

A layer parallel to the soil surface, whose physical characteristics differ from the layers above and beneath, as part of soil structure.

Net Primary Productivity

The rate at which plants in an ecosystem produce net useful energy (biomass) after accounting for the energy consumed through the process of respiration.

Ecosystem

A biological community of interacting organisms and their physical environment, considered a system through which nutrients are cycled and energy flows.