Answer:
density
Explanation:
Density is a measure of how many individuals (in this case, maple trees) are present within a given area (in this case, the 20-acre tract of land). To calculate the density, Frank would divide the number of maple trees by the area of land:
Density = Number of Maple Trees / Area of Land
In this case, Frank has 56 maple trees on a 20-acre tract of land:
Density = 56 trees / 20 acres
Density ≈ 2.8 trees per acre
So, the density of the maple trees on the land is approximately 2.8 trees per acre.