Q: Fact 1: Echinoderms lack respiratory and excretory systems. Fact 2: Starfish and sea urchins are also echinoderms. Given the two facts above, what is an example of an animal that lacks a respiratory and excretory system?

OPT:
1). Dog.
2). Human.
3). alpacas.
4). cacti.
5). Starfish.
6). Leeuwenhoek.
7). Elephants.
8). cows.
The answer is:
5).