Answer:
gases of nitrogen and many more
Answer:
Mammals first appeared
Explanation:
The dinosaurs became extinct one million years after the Cenozoic era started. The mammals first appeared as the modern culture first appeared in that era.
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Amino acids are known to be the building blocks of proteins. Amino acids are organic substances and organic substances contains carbon. Amino acids have an amine group and the carbonyl group (-OH) which contains nitrogen and oxygen respectively. Proteins can also be derived from other sources like meat. Proteins can perform different functions, being an antibody is one.
