The Following Statements About Community Structure and Interactions Are Correct

question 20

Multiple Choice

The following statements about community structure and interactions are correct, with the exception of which one?

• A)The trophic cascade model suggests that the lower trophic levels influence/control the higher trophic levels.
• B)High-diversity communities are often more resilient to invasive species than low-diversity communities.
• C)Communities show variation in the top-down and bottom-down community control.
• D)The dynamic stability hypothesis suggests that long food chains are less stable than low food chains.
• E)An organism that influences a community by changing its physical environment is referred to as an ecosystem engineer.

Describe the functions of macronutrients and their role in energy provision.

Grasp the importance of diverse food sources, such as fish, in a balanced diet.

Discern the role of hydration, dietary fiber, and major minerals in overall health.

Understand the basic concepts of nutrition including energy density in foods.

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Definitions:

Rubisco

An enzyme that catalyzes the first major step of carbon fixation in the process of photosynthesis.

Photorespiration

A metabolic pathway in plants that consumes oxygen, releases carbon dioxide, generates no ATP, and decreases photosynthetic output; it occurs when oxygen levels are high and carbon dioxide levels are low.

RuBP

Ribulose bisphosphate, a sugar involved in the initial step of carbon fixation in the process of photosynthesis.

Oxygen

A reactive, life-sustaining component of the atmosphere, essential for cellular respiration in aerobic organisms and critical for combustion processes.