The Qafzeh Fossil Is Dated at About

question 15

Multiple Choice

The Qafzeh fossil is dated at about:

• A)10,000 B.P.
• B)27,000 to 25,000 B.P.
• C)115,000 to 96,000 B.P.
• D)153,000 to 142,000 B.P.

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Definitions:

Antigen

Substance that induces a state of sensitivity or resistance to infection or toxic substances after a latent period; substance that stimulates the specific immune system; also called epitope.

Plasma Cells

Specialized white blood cells that produce antibodies in response to infections.

Cytotoxic T cells

A type of immune cell capable of killing cancer cells, infected cells, and other cells that are deemed a threat to the organism.

Antibodies

Proteins produced by the immune system that recognize and bind to specific antigens to help protect the body from infection.