Susan Is Studying Tree Growth in Two Regions That Have

Susan is studying tree growth in two regions that have been logged. One site was logged 10 years previously, and the second was logged two years prior to her study. In each of these study areas, she counts the number and types of trees that have a diameter greater than 5 cm. At the first site, she finds 10 scotch pines, 20 oak trees, and 5 dogwoods. At the second site she records 15 oak trees and 10 maple trees. Her study includes _____ organisms, _____ populations, and _____ communities.

A) 60; 3; 2
B) 3; 2; 60
C) 2; 3; 60
D) 60; 2; 3