Nothing its a myth
the relationship between human resource and material resource
Energy is to carbohydrates as structural material is to cells
no
Steel
Plant material is the main structural component of plants.
By 100 B.C. the use of iron as a semi-structural material was recognized.
By 100 B.C. the use of iron as a semi-structural material was recognized.
The genitalia.
Proteins
The meaning of the term structural steel lies in it usage. Structural steel, a construction material. Is made with a shape or cross section specific to its usage. There are many different shapes but they are all structural steel.
Protein
the resources that made by human from the material of the environment