The Symbols +, -, and O Are to Be Used

question 50

Multiple Choice

The symbols +, -, and o are to be used to show the results of interactions between individuals and groups of individuals in the examples that follow. The symbol + denotes a positive interaction, - denotes a negative interaction, and o denotes where individuals are not affected by interacting. The first symbol refers to the first organism mentioned.
-What interactions exist between the cattle egret and grazing cattle?

• A) o/-
• B) +/o
• C) +/-
• D) o/o
• E) -/-

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Definitions:

Angle of Repose

The steepest angle at which a sloping surface formed of a particular loose material is stable.

Slope Failure

The sudden or gradual collapse of a slope that is too steep for its material to resist the pull of gravity.

Calcium Carbonate

Calcium carbonate is a chemical compound, CaCO3, found in rocks as the minerals calcite and aragonite and is the main component of shells of marine organisms, snails, and eggs.

Clay Minerals

A group of hydrous aluminium phyllosilicates, sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations, which are found in soils and sedimentary rocks.