outer lighter coloured/alburnum region of wood is

If you cut the old trunk of a tree transversely, you will observe that the outer region of secondary wood is lighter in colour. This region of wood is known as

In an annual ring, the light coloured part is known as 1 autumn wood 2 late wood 3 heart wood 4 sap wood

The change of the lighter coloured variety of peppered moth, Biston betularia, to its darker variety (carbonaria ) is due to :

Alburnum is also called as

Replacement of the lighter-coloured variety of peppered moth (Biston betularia) to its darker veriety (Biston carbonaria) in England is the example of

The change of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria)is due to

Replacement of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria) in England is the example of

The change of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria)is due to