Confused and have questions? We’ve got answers.
With Chegg Study
, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors
From Biology-Online Dictionary
Factors or conditions that maintain the disabling symptoms in an individual.
The presence of a disease or disorder can be explained by the following factors:
…and the absence of :