Even Though K- and M-Type Stars Are Suitable for Life

question 35

Multiple Choice

Even though K- and M-type stars are suitable for life, why might they not have many habitable planets around them?

• A) because their habitable zones are very wide
• B) because their habitable zones are very narrow
• C) because their lifetimes are too short
• D) because they contain too few heavy elements to form planets

---

Definitions:

IgG Antibodies

A type of antibody that is the most common and widely distributed in body fluids, playing a crucial role in immune response.

Memory Cells

A type of immune cell that remains in the body long term after an infection has been defeated, enabling a faster and stronger response upon re-exposure to the same pathogen.

IgM Antibodies

The first type of antibody the body makes when it fights a new infection, providing an initial line of defense against pathogens.

Cytotoxic T Cells

A type of immune cell that kills cancer cells, cells that are infected (particularly with viruses), or cells that are damaged in other ways.