Figure 45-1 ​ ​

question 63

Multiple Choice

Figure 45-1 ​

​
The immune system component with a principal role at point B in the accompanying figure is:

• A) memory cells.
• B) IgM antibodies.
• C) IgG antibodies.
• D) cytotoxic T cells.
• E) antibody IgA.

---

Definitions:

Geological Theory

A foundational principle in geology that explains the structure of the Earth’s crust and the processes that shape it over time, including plate tectonics and erosion.

Deposits

Materials laid down or settled from a state of suspension or solution in a fluid, often referring to geological or financial contexts.

Canadian Shield

A large geological shield covered by a thin layer of soil that spans across eastern and central Canada, known for its rich mineral deposits.

Metallic Minerals

Natural mineral formations containing sufficient metal to be beneficially extracted and technically feasible to mine.