The "Time Since Perturbation" Hypothesis Proposes That, Compared to Temperate

question 30

Multiple Choice

The "time since perturbation" hypothesis proposes that, compared to temperate and polar regions, the tropics are

• A) more diverse because humans have not yet had much impact there.
• B) more diverse because they are disturbed more severely by cooling during glaciations.
• C) less diverse because they are disturbed more severely by cooling during glaciations.
• D) more diverse because they are less heterogeneous in habitat.
• E) more diverse because they are disturbed less frequently.

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Definitions:

Cell Membrane

The semipermeable membrane surrounding the cytoplasm of a cell, which regulates the passage of substances in and out of the cell.

Cadherins

Transmembrane proteins that are components of adhering junctions between animal cells.

Adhering Junctions

Cell-to-cell junctions that mechanically attach the cytoskeleton of a cell to that of another, playing a key role in maintaining tissue integrity.

Desmosomes

Cell structures specialized for cell-to-cell adhesion, found particularly in epithelial and cardiac tissues, helping to resist shearing forces.