4.Digestion begins in what part of the digestive system?
A. Saliva
B. stomach
C. esophagus
D. mouth

5. Which is NOT true about skin?
A. it insulates the body
B. it protects the ski
C. it regulates body heat.
D. it regulates body heat

6. What specific process allows our body to expel carbon dioxide?
D. perspiration
C. inhalation
A. excretion
B. exhalation

7. Which of the following is NOT a good practice in taking care of the body.

A. Having regular exercise.
B. Eating too much sweet
C. Observing proper hygiene.
D. Eating well-balanced diet​