Which of the following statements is false? 1. All polypeptide chains are similar in length.
2. The R groups are what determine the structure of a polypeptide.
3. Each polypeptide has a unique amino acid sequence.
4. Each amino acid has a unique R group.

The R groups are what determine the structure of a polypeptide

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

i it is d i hope it