1 Subjects: “...Origin of Life...”

2 Subjects: “...centre of origin...”

3 Subjects: “...original features...”

4 Subjects: “...geographical origin area...”

5 Subjects: “...vegetation's origin...”

6 Subjects: “...probable geographic origin...”

7 Subjects: “...centres of origin...”

8 Subjects: “...centres of origin...”

9 Subjects: “...centres of origin...”

10 Subjects: “...centres of origin...”