genes that code for heart defects. infections that damage the heart muscle. other diseases that cause the heart to wear out. intense exercise that increases the heart rate.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Doctors have determined that each of these factors could cause heart disease in humans except
Possibilities:
- genes that code for heart defects.
- infections that damage the heart muscle.
- other diseases that cause the heart to wear out.
- intense exercise that increases the heart rate.

intense exercise that increases the heart rate.