5. Covid-19 virus greatly affects most part of the Respiratory System and Nervous System of the
body. How could a person make his/her organ or body system function well to avoid diseases at
all times?
A. Have a balanced diet and proper nutrition.
B. Maintain personal hygiene and cleanliness of the surroundings.
Have enough rest and sleep to give our body enough time to build up energy and repair
worn-out tissues.
D. All of the above.​