Biology

The correct answer is: D.They use local regulators to detect host or danger signals.

Explanation:

Immune cells communicate through the use of local regulators such as cytokines and chemokines. These molecules are secreted by cells to signal nearby cells, facilitating the immune response by directing immune cells to areas of infection or injury, and helping them detect pathogens or danger signals.

The other options are incorrect because:

A.They use neurotransmitters to send signals: Neurotransmitters are primarily used for communication in the nervous sys...