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

question 19

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 mycorrhizae and evergreen tree roots?

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

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Definitions:

Sarcomere

One of many units, arranged linearly within a myofibril, whose contraction produces muscle contraction.

Axial Skeleton

Part of the vertebrate skeleton forming the vertical support or axis, including the skull, the rib cage, and the vertebral column.

Ribs

The curved bones which form the rib cage, surrounding the chest enabling lung expansion while protecting thoracic organs.

Fibrocartilage

Cartilage with a matrix of strong collagenous fibers.