Homologous structures such as the bones in wings, flippers, and arms are most closely concerned with

A) comparative anatomy.
B) biogeography.
C) the fossil record.
D) comparative embryology.
E) comparative biochemistry.

Periderm arises from ________.

A) xylem
B) cork cambium
C) pith
D) cortex
E) sclerenchyma

An organelle is

A) a small structure within a cell.
B) a structure composed of several tissue types.
C) the basic structural unit of all living organisms.
D) a group of organs with a common set of functions.
E) a group of cells with similar structure and function.

Turnover is generally higher in unionized settings than it is in nonunionized settings.