Most everyone knows that we use proteins, carbohydrates and fats for energy. Calories are measurement of a unit of heat or food energy. For example, we can achieve four calories per gram of proteins and carbohydrates, and nine calories per gram from fats.
Tree Variety. Virginia pine (Pinus virginia) is the major Christmas tree species for the acidic soils found in East Texas. A grower can produce a 6- to 8-foot Virginia pine Christmas tree in 3 to 5 years, depending on soil and climatic conditions.
Needles and pines: Christmas tree sales brisk this year. Buy Now. Robert Sturgeon, 11, right, works hard to cut down a tree as Kim Akers, left, of Clarksville helps hold up the tree at Kris Kringle's Trees Tuesday, Dec. 13, 2011, in Cedar Falls, Iowa.