Examlex
Until children are 3 years old they identify themselves and others as "boys" or "girls" based on hairstyle,clothing,and other nonanatomical cues.
Gas Exchange
The process by which organisms exchange gases with their environment, including the uptake of oxygen and the release of carbon dioxide.
Periderm
is the protective outer secondary layer of bark in woody plants and trees, comprising the phellem, phellogen, and phelloderm.
Sapwood
The outer, younger part of a tree's trunk or branch that is active in transporting water and minerals from the roots to the leaves.
Secondary Xylem
Plant tissue that transports water and nutrients upwards from the roots; it also provides structural support and is a major component of wood.
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