I think it’s organism since it already stated skeletal and respiratory then it means it cannot be tissue or organ because skeletal is included so i say go for organism
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.
The answer is c, because a compound is two substances combined chemically and a mixture is not
B. Eukaryotes only have a nucleus!
