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. Quartz and Mica B. Sand Salt C. Sand and Silicates D. None of these
A. Saudi Arabia B. UAE C. Singapore D. Indonesia
A. Bill Gates B. David Baltimore C. Tedros Adhanom D. Elon Musk
A. Paris B. Rome C. Los Angeles D. Moscow
A. Volga Baltic B. Baloyi-More Baltic C. Grand China Canal D. None of these
A. Indonesia B. Egypt C. South Africa D. Mexico
A. Moscow B. Valletta C. Brussels D. Reykjavik
A. Oxygen B. Hydrogen C. Carbon dioxide D. Silicon