The Exploratory Life-Sciences Experiments Aboard the Viking Spacecraft Landers Found

question 190

Multiple Choice

The exploratory life-sciences experiments aboard the Viking spacecraft landers found evidence of

• A) a very sterile environment in which life could not have existed and a very chemically inert soil, reacting with almost no reagents.
• B) primitive life-forms such as elementary bacteria that should not be a hazard when humans explore Mars.
• C) very reactive chemistry in the Martian surface rocks, but no evidence of life or remnants of life-forms.
• D) primitive life-forms that had existed on Mars earlier in its history but had not survived.

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Definitions:

Tissue Cells

The basic structural and functional units of tissues in living organisms, varying widely in structure and function based on their location and task.

Coagulation

The process of blood changing from a liquid to a gel, forming a blood clot, which is an essential part of hemostasis to stop bleeding.

Agglutination

The clumping together of particles, typically cells or proteins, often caused by an antigen-antibody reaction.

Hemostasis

The process of blood clotting and the cessation of bleeding from a damaged vessel.