ACROSS
1. Creatures lose their homes mainly due to ... (7,4)
4. The movement of people from rural areas to urban settlements ...(11)
7. The sudden increase in population is called population ...(9)
8. This chemical has caused many birds' eggshells to be brittle ...(3-abbreviation)
12. The ....... of dams has fragmented habitats (12)
13. Many insecticides are used on crops, but they contain ....... which kill many animals (7)

DOWN
2. The construction of roads often creates ..... of movement for animals (8)
3. Charles Darwin showed that the extinction of many animals is the natural process of ... (9)
5. The destruction of forests is often called ... (13)
6. Genetic ........ within a species is vital for adaptation of the species (9)
9. In places such as Namibia farmers shoot predators in what is dubbed as 'predator ........' (7)
10. When barriers are created, species become ...... from others of the same kind (8)
11. When oil tankers sink, the consequences are sometimes devastating as it can cause ... (9)