Psychological experience can alter biological functioning

Which of the following is the most reasonable description of how to interpret a positive correlation between babies crying and the amount of time their parents spend holding them?

a. when babies don't cry very much parents tend to hold them more b. parents tend to hold babies more who cry more c. parents should hold babies more if they want them to cry less d. crying causes parents to hold babies more and holding babies causes them to cry even more to get attention

Twins who develop from seperate fertilized eggs are called _____ twins..

A) epigenetic B) monozygotic C) identical D) fraternal