Dr. Smith is interested in how people change throughout their lives. She is particularly interested in how speech and language adapts and changes depending on a person's age. Dr. Smith is likely trained in what subfield of psychology?
developmental psychology

The answer is indeed developmental psychology.

Explanation:

Developmental psychology aims to study human change, growth, development, and consistency over the lifespan. It can approach several aspects of human life, such as biological, social, intellectual, perceptual, emotional, cognitive, physical, etc. Simply put, psychologists who specialize in this area - like Dr. Smith - wish to study how people change and grow, and what influences such change and growth.

paul revere would be your answer : )

if interdependence implies a two-way dependence, and if each partner is equally dependent on the other for success, then there is an equal commitment to the making the partnership successful. the advantage is sustainability of the relationship, the disadvantage is that decisions are "democratic" and therefore may take longer to reach and more likely to be a compromise (which is not always the best solution). as the interdependence moves away from equality, the decisions become more influenced by the more independent partner. in the extreme the relationship becomes more dictatorial and more like "master-slave". generally the relationship has less commitment in both directions and is more likely to be temporary.

if one generalizes (and one shouldn't), equity partnerships, which is probably what is implied by interdependence, can be slow to progress or change but durable. the extreme alternative, independent-dependent partnerships tend to be efficient but more fragile.

hope this but you will have to site your own evidence. : )