A. measuring the relative humidity in air
B. detecting the sound waves in water
C. measuring height above sea-level
D. measuring the intensity of sea-current
A. skeletal
B. excretory
C. nervous
D. digestive
A. one-eighth that of earth
B. one-sixth that of earth
C. one-tenth that of earth
D. one-fourth that of earth
A. useful to life
B. harmful to life
C. both useful and harmful to life
D. None of above
A. infectious diseases
B. deficiency diseases
C. water borne diseases
D. diseases of debility
A. the gums
B. the teeth
C. salivary glands
D. lungs
A. left auricle
B. right auricle
C. right ventricle
D. left ventricle
A. taste and smell nerves
B. nasal and mouth cavities
C. taste nerves and the nose
D. smell nerves and the mouth
A. 0.04%
B. 0.004%
C. 0.4%
D. 4.4%
A. epdermis
B. ectoderm
C. dermis
D. endoderm
