Q: Hormones, ions, and neurotransmitters are all types of what?


Read this paragraph and choose the correct option from the provided answers:

The type of chemical signal a cell will send differs depending on the distance the message needs to go. For example, hormones , ions, and neurotransmitters are all types of signals that are sent depending on the distance the message needs to go. Endocrine signals are hormones, produced by endocrine organs. These signals travel through the blood stream to reach all parts of the body.

 Choices:

- nutrients

- pathogens

- proteins

- chemical signals


A:
chemical signals