Mark and Karen found out they were pregnant with twins. Darla was concerned, but thankfully Daniel earned his degree in child development and was able to ease her with answers regarding their children. Now the twins (Daniel and Darla) are almost 2, and Karen is returning to work. Karen is still worried about what that will do to the twins development.

a. Which concept best explains why the twins cry when their parents leave for work?
b. Because Daniel and Darla greet their returning parents with smiles, they are said to have formed a _ (blank) _?
Darla and Daniel are now 4. During the summertime, Karen tries to establish a feeding routine for the twins, but they are so picky, she gives them whatever they are willing to eat. For Darla, this ends up being sweet foods, but for Daniel, it's salty foods. Karen discusses this with Mark one night, and he brings up a the tips for establishing healthy eating habits that he learned during his developmental degree. Mark tells Karen that she should try to remember that _ (blank) _ varies, but that there are no _ (blank) _.
c. What are the two tips he provided to Karen?
d. Mark has noticed that Darla and Daniel are talking more frequently (and rapidly) now that they're 5. He tells Karen that their children's language development has grown dramatically. Therefore, Mark would suggest which brain hemisphere is most responsible for their language skills?
e. Karen overhears Darla tell Daniel that her doll can't go with her to daycare because it's tired from being up all night. At first Karen thinks Darla must be playing with her toys when she should be sleeping, but remembers that it could be _ (blank) _ instead.