The US Census Bureau Estimates That from 2000 to 2009, the the Net

question 251

Multiple Choice

The U.S. Census Bureau estimates that from 2000 to 2009, the net inflow of illegal immigrants was about

• A)100,000 annually.
• B)250,000 annually.
• C)350,000 annually.
• D)700,000 annually.

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Definitions:

Helper T cells

A type of white blood cell that plays a central role in the immune response by activating other immune cells to fight infection.

Infects

The process by which a pathogen enters, invades, and multiplies in a host organism, causing disease or infection.

Immunotherapy

A type of cancer treatment that helps your immune system fight cancer.

Cytotoxic T cells

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