121. Olfactology is the scientific study of ____ :

122. Oncology focuses on ___:

123. Oneirology is the study of ____ :

124. Onomastician studies _____:

125. Oology focuses on ____:

126. Ophiology is the study of ____ :

127. Among various sciences, Ophthalmology is the scientific study of ___:

128. What does Optics study?

129. Ornithology is the study of ___ :

130. What does Orology study?

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