Which system is considered a parallel communication system to the nervous system in the body with its secretions passing directly into the bloodstream or lymph system?

Endocrine.

Explanation:

The nervous system is one of the most important system of the body that regulates the sensory information and coordination of the other system of the body.

The nervous system together with the endocrine system work together to maintain the homeostasis of the body. The endocrine system releases hormone upon the nerve stimulation by the nervous system of the body. The changes in the environment are sensed by the sensory receptor that stimulates the production of specific hormone.

Thus, the answer is endocrine.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.