A White-Dwarf Star Is at What Stage of Its Evolution

question 69

Multiple Choice

A white-dwarf star is at what stage of its evolution?

• A) Protostar phase,just after formation
• B) Very late phase of evolution
• C) Post-supernova stage,after the explosion of a star
• D) Main-sequence phase,"middle-aged"

---

Definitions:

Intracellular Antigens

Molecules located within cells that, when recognized as foreign by the immune system, can trigger an immune response.

Cell-Mediated Immunity

A type of immune reaction that is independent of antibodies, instead relying on the activation of phagocytes, antigen-specific cytotoxic T-lymphocytes, and the secretion of diverse cytokines when reacting to an antigen.

Antibody-Mediated Immunity

A type of adaptive immunity where B cells produce antibodies that target and neutralize foreign pathogens.

Histamine

A compound involved in local immune responses, as well as regulating physiological functions in the gut and acting as a neurotransmitter.