What is the primary difference between stereoisomers and enantiomers?

Given the structures of maleic acid and fumaric acid, which statement correctly describes their configurations?

What is the correct sequence of steps to determine the R or S configuration of a chiral center?

Why can different enantiomers of a drug like thalidomide have drastically different biological effects?

What does the term 'cis' refer to in stereochemistry?

If a chiral center has the following groups: -OH, -CH3, -Cl, and -H, what is the correct order of priority for determining R/S configuration?

Which of the following statements best explains why thalidomide enantiomers have different biological effects?