Fill in the appropriate word(s) from the list below. Use the word(s) only once.
food,to pass,a means,to have,round,survival,to give,nervous,to spread, members, to cause, explosion.
1....................................techniques
2...................................damage
3....................................a resistance to sth
4.................................... knowledge down
5....................................of defence
6 all year..............................
7 population.......................
8.............................system
9............................the message
10............................supply
11.............................birth to
12.......................... of the colony