Q: Fact 1: All animals are heterotrophs. Fact 2: Heterotrophic bacteria derive energy from the breakdown of organic molecules. Given the two facts above, what derive energy from the breakdown of organic molecules?

Pick from:
1). Most plants;
2). hydrocarbons;
3). potatoes;
4). all stones;
5). all water sources;
6). all mountains;
7). all animals;
8). Generating heat;
A:
7).