Factors affecting fish populations

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 5. The act of getting ___ (11)
  2. 6. Undesirable state of the natural environment being contaminated with harmful substances as (9)
  3. 7. Photosynthetic or plant constituent of plankton (13)
  4. 8. The movement of persons from one country or locality to another (9)
  5. 9. Any substance that can be taken in by a green plant and used in organic synthesis (plural) (9)

Down

  1. 1. An illness that harms the body (7)
  2. 2. The gathering of a ripened crop (10)
  3. 3. The quality or state of being ___ (9)
  4. 4. The process of generating offspring (12)