The Possible Collision of a Large Meteorite with Earth 65

question 98

Multiple Choice

The possible collision of a large meteorite with Earth 65 million years ago may explain

• A) the existence of Gondwana.
• B) continental drift, according to Alfred Wegener.
• C) the mass extinction that killed off the dinosaurs.
• D) contemporary atmospheric conditions on Earth.
• E) None of the above

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Definitions:

Nervous

Pertaining to the nervous system, which includes the brain, spinal cord, and peripheral nerves, or feeling anxious and apprehensive.

Steroid

A type of organic molecule with a characteristic molecular structure containing four rings, used in medicine to reduce inflammation and as hormones in the body.

IgM

Immunoglobulin M, a type of antibody that is produced initially in response to an antigen and indicates a current infection in the body.

Antibodies

Proteins produced by the immune system that recognize and neutralize foreign substances such as bacteria and viruses.