In Any Ecosystem, Terrestrial or Aquatic, What Group(s)is (Are)always Necessary

question 74

Multiple Choice

In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?

• A) autotrophs and heterotrophs
• B) producers and primary consumers
• C) photosynthesizers
• D) autotrophs
• E) green plants

---

Definitions:

REM Rebound

The tendency for REM sleep to increase following REM sleep deprivation (created by repeated awakenings during REM sleep).

Insomnia

Insomnia is a sleep disorder characterized by difficulty falling and/or staying asleep, affecting a person's ability to get restful sleep.

Vigorous Physical

Intense bodily activity that increases heart rate and energy expenditure, contributing to physical fitness and health.

Milk Before Bedtime

A common dietary habit or recommendation which may promote a feeling of comfort and potentially aid in improving sleep quality, though effects can vary from person to person.