Question

what biological systems rely on cellular communication?
the excretory system, cardiovascular system, and respiratory system.
the immune system, nervous system, and endocrine system.
the circulatory system, urinary system, and integumentary system.
the musculoskeletal system, lymphatic system, and reproductive system.
the digestive system, respiratory system, and skeletal system.

Explanation:

Cellular communication is crucial for coordinating functions in biological systems. The immune system uses cytokines and cell - cell interactions for defense. The nervous system relies on neurotransmitters for signal transmission. The endocrine system uses hormones (chemical messengers) secreted into the bloodstream to communicate with target cells. These systems depend on cellular communication for proper functioning.

Answer:

The immune system, nervous system, and endocrine system.