Meaning: 'Involves' means to include or to have as a necessary part, indicating that fertility is directly related to the number of children women have.

Wrong options:

• invokes: 'Invokes' suggests calling upon or summoning, which does not fit the context of describing a process related to childbearing.
• decides: 'Decides' implies making a choice or determination, which is not applicable to the process of fertility as it does not dictate the number of children directly.
• issues: 'Issues' refers to distributing or providing something, which does not align with the context of fertility affecting childbearing.

Correct answer: device

Explanation: The term 'device' is appropriate as it refers to a tool or instrument used for a specific purpose, which in this case is the Life Table used for studying mortality. This fits both grammatically and contextually within the sentence.

Meaning: 'Device' means a tool or instrument designed for a particular purpose, indicating that the Life Table serves as a statistical tool for demographers.

Wrong options:

• mathematics: 'Mathematics' refers to the abstract science of number, quantity, and space, which does not fit as it is not a tool but rather a field of study.
• subject: 'Subject' refers to a topic or area of study, which does not accurately describe the function of the Life Table as a tool.
• theorem: 'Theorem' is a statement that has been proven based on previously established statements, which does not apply to the practical use of the Life Table.

Correct answer: migrations

Explanation: The term 'migrations' is the correct choice as it specifically refers to the movements of people that are somewhat permanent, fitting the context of the sentence. It aligns grammatically with the plural form needed in this context.

Meaning: 'Migrations' refers to the movements of people from one place to another, particularly when these movements are intended to be long-term or permanent.

Wrong options:

• relations: 'Relations' refers to connections or associations, which does not accurately describe the act of moving from one place to another.
• functions: 'Functions' implies a specific role or purpose, which does not relate to the concept of movement across boundaries.
• boundaries: 'Boundaries' refers to limits or borders, which does not fit as it does not describe the act of moving.

Correct answer: residence

Explanation: The word 'residence' is the correct choice as it refers to the place where someone lives, which is relevant to the context of migration studies. It fits grammatically and contextually within the sentence.

Meaning: 'Residence' means the place where a person lives, indicating that demographers study where people reside to understand migration patterns.

Wrong options:

• eat: 'Eat' refers to the act of consuming food, which is irrelevant to the context of demographic studies.
• pray: 'Pray' refers to the act of communicating with a deity, which does not relate to the study of population movements.
• work: 'Work' refers to employment or labor, which is not the focus of demographic studies regarding migration.

Correct answer: attracting

Explanation: The word 'attracting' is appropriate as it indicates that demography is drawing in students from various fields. This fits grammatically and contextually, as it describes the action of drawing interest.

Meaning: 'Attracting' means drawing or pulling in, indicating that demography is appealing to students with backgrounds in social sciences, statistics, or health studies.

Wrong options:

• rejecting: 'Rejecting' implies dismissing or refusing, which contradicts the idea of students being drawn to the field.
• consulting: 'Consulting' refers to seeking advice or information, which does not fit the context of students being drawn to study demography.
• conspiring: 'Conspiring' implies plotting or planning secretly, which is unrelated to the educational context of attracting students.