Cases of word usage

1) a kind of small poisonous snake, common in Europe (adder)

2) a substance added in small amounts for a particular purpose (additive)

3) a very small kind of animal, consisting of one cell (amoeba)

4) (of) a substance (e.g. penicillin) produced by very small fungi, able to destroy bacteria (antibiotic)

5) a learner of a trade who has agreed to work for a number of years for a small amount of money in return for being taught (apprentice)

6) a small animal of South America with a shell of bony plates, able to roll itself into a ball when attacked (armadillo)

7) any of many small planets between Mars and Jupiter (asteroid)

8) (kinds of) very small living things, many of which cause disease or help dead animals and plants to decay (bacteria)

9) a pen with a small ball in place of a nib which rolls ink onto paper (ballpoint)

10) a kind of small chicken (bantam)