Why is heartwood darker in color than sapwood?

Heartwood is closer to the center of the stem; sapwood is away from the center of the stem.

Heartwood does not conduct water; sapwood is active in fluid transport.

Heartwood contains xylem tissue; sapwood contains phloem tissue.

Question

Why is heartwood darker in color than sapwood? 



Heartwood is closer to the center of the stem; sapwood is away from the center of the stem.



Heartwood does not conduct water; sapwood is active in fluid transport.



Heartwood contains xylem tissue; sapwood contains phloem tissue.

anonymous · Answer

@BassCatcher15

anonymous · Answer

I think A but I have no clue honestly.  Lol