Which concept is used in research to make sure that different scientists who are exploring the same concept are able to conduct a true replication of the original experiment?

People who suffer from panic attacks

a. seem to be extremely sensitive to any elements of risk or danger in their environments. b. will have a panic attack if they breathe air laced with helium. c. often have a twin who also suffers from panic attacks. d. inherited a recessive gene for the disorder. e. do not usually experience anticipatory anxiety.

Evolutionary theory proposes that every trait that now exists has adaptive value

Indicate whether the statement is true or false.