The exchange of oxygen between blood and air takes place in the _______?
B. Lungs
C. Heart
D. All of these
Correct Answer: B. Lungs
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B. Lungs
C. Heart
D. All of these
A. Ganges Delta
B. Mississippi Delta
C. Amazon Delta
D. Niger Delta
A. Internal structural changes in matter
B. Composition of matter
C. Properties of matter
D. Composition and properties of matter
A. definite volume
B. definite shape
C. crystalline structure
D. no crystalline structure
A. ionic substances
B. metallic substances
C. molecular solids
D. covalent network solids
A. can be liquefied
B. have different boiling points
C. are gases at room temperature
D. have different densities
A. NaCI
B. RbCI
C. LiCI
D. CsCI