The Natural Killer Cells That Circulate the Body

question 14

Multiple Choice

The natural killer cells that circulate the body:

• A)are present in infants and children,but disappear by middle age
• B)engulf teratogens and viruses and devour them
• C)push infected cells through the body to the spleen
• D)inject diseased cells by injecting them with toxic chemicals

---

Definitions:

Subducted Plate

A tectonic plate that is being forced downward into the mantle beneath another plate at a convergent boundary.

Continental Rifting

The process where a continental landmass breaks apart due to tectonic forces, often leading to the formation of new ocean basins.

Continent Intact

This term is unclear but may refer to a continent remaining geologically stable or undivided by significant natural events over time.

Continental Rift

A linear zone where the Earth's crust and lithosphere are being pulled apart and is the initial stage of a continental break-up leading to the formation of a new ocean basin.