Final answer:
The statement that a longitudinal design provides a series of pictures tracking changes over time is true. Longitudinal research studies the same group of individuals over an extended period to observe changes, although it requires significant time and financial resources.
Step-by-step explanation:
According to the text, a longitudinal design does provide a series of pictures, which track the changes that take place over time, and this statement is true. Longitudinal research involves studying the same group of individuals repeatedly over an extended period to observe changes and developments. This type of research can offer insights into patterns such as developmental stages in life or changes in behavior due to aging or external factors. An example would be examining the dietary habits of a cohort of individuals at various stages in their life to understand how their diets evolve.
Continuous narrative in arts, such as in graphic novels, employs a similar principle by showing progression over time within the same picture plane. Additionally, characteristics of longitudinal waves in physics show disturbances parallel to the wave's direction, signifying progression and movement with time.
However, longitudinal studies do come with limitations such as demanding substantial time and financial investments, and the results are not known until the study is completed, which could be many years.