1. The phrase symptom of disease means ?

subjective evidence of disease or physical disturbance broadly : something that indicates the presence of bodily disorder.

Explanation:

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1.the evidene of the reaction

2.yes

3.yes

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.