What is an example of an autotroph and a heterotroph?

Common symptoms of an iron-defiency anemia include muscle weakness shortness of breath and lightheadedness why does iron deficiency causes these symptoms

What atoms are found in nucleic acid and what atoms are found in proteins? compare the monomers that make up a nucleic acid versus what are the monomers that make up a protein?

Which best example explains the surface tension of water