What Were Charles Darwin's Two Fundamental Insights About the Process

question 21

Multiple Choice

What were Charles Darwin's two fundamental insights about the process of evolution?

• A) The environment selects on variation in the traits of individual organisms, and all species have descended from one or a few common ancestors.
• B) All species have descended from one or a few common ancestors, and populations, not individuals, evolve over time.
• C) The environment selects on variation in the traits of individual organisms, and organisms are in a constant struggle for existence.
• D) Populations, not individuals, evolve over time, and evolutionary change is connected to environmental fit.

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Definitions:

T-cell Count

A measure of the number of T-cells, a type of white blood cell, in the bloodstream, used to assess immune system health, particularly in the context of HIV/AIDS.

HIV Antibodies

Proteins produced by the immune system in response to infection with the human immunodeficiency virus, used in testing for HIV.

Antigens

Substances that the body recognizes as foreign and that can trigger an immune response, typically proteins or polysaccharides on the surfaces of bacteria, viruses, or other pathogens.

Antibodies

Proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses.