In Which Way Are Protostars Different from Main-Sequence Stars of the Same

question 30

Multiple Choice

In which way are protostars different from main-sequence stars of the same mass?

• A) Protostars are smaller than main-sequence stars.
• B) Protostars are hotter than main-sequence stars.
• C) Protostars have a different energy source from main-sequence stars.
• D) Protostars have longer lifetimes than main-sequence stars.

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Definitions:

T Cells

A type of lymphocyte involved in the immune response, playing critical roles in identifying and killing infected cells or cancer cells.

Adaptive Defense Mechanism

A component of the immune system that evolves its response to specific pathogens through memory of previous encounters, enhancing protection upon subsequent exposures.

Stomach Acids

The digestive fluids secreted by the stomach's lining, containing hydrochloric acid and digestive enzymes, crucial for breaking down food.

Antibodies

Proteins produced by the immune system to neutralize or destroy toxins or disease-causing organisms.