Suppose you chop down a plant in the woods and bring it home to examine. you cut a cross section of the stem and you note that it has pith in the center. how would you classify this plant?

Mostly plants with pith in the centre have dicots stems mostly they are usually darker inner wood of a large diameter trunk is termed the heartwood and is the result of tylosis. The outer, living wood is termed the sapwood. New pith growth is white or pale in color, as the tissue ages it commonly darkens to a deeper brown color. In trees pith is usually present in young growth.

it would be heredity

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.