Final answer:
Life tables are used to study mortality rates and life expectancies. Most life tables are constructed for insects, which have a short life span and exhibit a Type III survivorship curve.
Step-by-step explanation:
Life tables provide important information about the life history of an organism. They divide the population into age groups and often sexes, showing how long a member of that group is likely to live. Life tables are commonly used to study the mortality rates and life expectancies of different organisms. In this case, most life tables have been constructed for insects, as they are short-lived and exhibit a Type III survivorship curve. This curve indicates high mortality rates during early developmental stages and relatively low mortality rates in later stages.