Select from the following.
(1). burrs;
(2). white;
(3). barnacles;
(4). parasites;
(5). alpacas;
(6). potatoes;
(7). mature;
(8). insects;

Fact 1: Adult worms go through a major transformation to develop reproductive organs. Fact 2: Mature adult worms are 5cm long. Given the two facts above, what worms go through a major transformation to develop reproductive organs?
Answer:
(7).