What is difference between nervous and chemical(endocrine) system???

The differences are given below ↓

Nervous System

Electrical impulses are the messengers in the nervous systemBrain and the spinal cord constitute the nervous systemNerve impulses are transmitted through neuronsThe nervous system is under both voluntary and involuntary controlNerve impulses make use of the neurotransmitters at synaptic clefts and sodium and potassium channels and enter the target cellsResponses are localised

Chemical (Endocrine) System

Hormones are the chemical messengers in the endocrine system that target cells through the bloodstreamGlands and organs like thyroid, pituitary glands and reproductive organs (ovaries and testes) are involved in the endocrine systemHormones are transmitted through blood vesselsThe endocrine system is under involuntary controlThe hormones enter into the target cells by diffusing through the plasma membrane or by binding to the cell receptorsResponses are widespread

The answer is observations and interpreting.