Our environment

1234567
Across
  1. 3. organisms which break down dead plants and animals
  2. 4. inter relationship between plants and animals with their environment
  3. 7. accumulation of harmful chemicals in the topmost consumer
Down
  1. 1. which make their own food
  2. 2. gas which protect us from UV rays
  3. 5. organisms which depend on other plants and animals for food
  4. 6. the ultimate source of energy