One Key Aspect of an Experiment That Is Missing in Other

question 96

Multiple Choice

One key aspect of an experiment that is missing in other research designs is

• A)the ability to test predictions.
• B)the use of variables.
• C)the use of operational definitions.
• D)random assignment.

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Definitions:

Ecological Pyramid

A graphical representation that shows the biomass or bio productivity at each trophic level in a given ecosystem.

Producer Trophic Level

The first level in a food web, comprised of organisms that produce organic materials (usually through photosynthesis) from inorganic substances.

Base

A substance that can accept hydrogen ions (protons) or more generally, donate a pair of valence electrons; in nucleic acids, a nitrogen-containing molecule that forms part of the genetic code.

Denitrifying Bacteria

Bacteria involved in the nitrogen cycle, converting nitrates in soil into nitrogen gas, thereby reducing nitrogen availability to plants.