What Point Defines the End of the Pre-Main-Sequence Phase of a Star's

question 41

Multiple Choice

What point defines the end of the pre-main-sequence phase of a star's life and the start of the main-sequence phase?

• A) The star begins to expand and become a red giant.
• B) Convection begins in its interior.
• C) The star stops accreting mass from the interstellar cloud.
• D) Nuclear reactions begin in its core.

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Definitions:

Military Intervention

The act of a nation deploying its military forces to enter another territory with the aim of achieving specific political or military objectives.

Land Reform

A government-initiated process of redistributing land, typically from those who own large amounts to those with little or none, with the goal of improving equity and productivity.

Commercial Interests

Activities, decisions, or endeavors driven by the desire to generate profit or financial gain, typically within a business context.

Dependency Theory

A perspective in international relations and economics that examines the structural relationships between developed and developing countries, asserting that the development of the former comes at the expense of the latter.