Final answer:
The statement 'Metazoans are the only organisms capable of producing electrical signals' is false.
Step-by-step explanation:
The statement 'Metazoans are the only organisms capable of producing electrical signals' is false. While it is true that metazoans, which include animals, do produce electrical signals for various functions, they are not the only organisms capable of doing so. There are other organisms, such as certain bacteria and plants, that can also generate electrical signals. For example, electric eels and some species of electric fish are metazoans that produce electrical signals to navigate and communicate. However, there are also bacteria that can produce electrical signals as part of their metabolic processes, and certain plants, like the Venus flytrap, generate electrical signals to trigger their trap mechanisms.