Solve these clues to fill the grid.
- The movement of persons from one country or locality to another
- 4 Across
- The force used in ___
- 5 Across
- The end of life
- 6 Across
- Migration into a place
- 9 Across
- A magnitude or frequency relative to a time unit (plural)
- 10 Across
- An independent country within the British Commonwealth
- 15 Across
- Enterprising or ambitious drive
- 16 Across
- How long something has existed
- 1 Down
- Armed fighting between countries
- 2 Down
- The number of inhabitants in a given place
- 3 Down
- Feeling of deep sadness that lasts a long time
- 7 Down
- The event of being born
- 8 Down
- A perceptual structure (plural)
- 11 Down
- The process of an individual organism growing organically
- 12 Down
- Change toward something smaller or lower
- 13 Down
- People who are old collectively
- 14 Down