The major ingredient of leather is———–?
A. Collagen B. Polymer C. Nucleic acid D. None of these
A. Collagen B. Polymer C. Nucleic acid D. None of these
A. Indonesia B. Egypt C. South Africa D. Mexico
A. Gabon B. Laos C. Lesotho D. Niue
A. Indonesia B. Maldives C. South Africa D. Egypt
A. 10,000 B. 11,000 C. 12,000 D. 13,000
A. Australia B. China C. Russia D. Greece
A. Kenya B. Australia C. Sri-Lanka D. Thailand
A. Sulfuric acid B. Hydrochloric acid C. Nitric acid D. None of these