Approximately______________percent of the U

question 76

Multiple Choice

Approximately______________percent of the U.S.population are members of the working class.

• A)30
• B)40
• C)50
• D)60

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Definitions:

Primitive Brain

An early stage in the evolution of the brain, characterized by basic structures that control fundamental life functions, seen in lower animals.

Turgor Pressure

The pressure of water inside plant cells against the cell wall, which contributes to the stiffness of plant tissues and is essential for plant stability and nutrient uptake.

Pollinators

Animals that facilitate plant reproduction by transferring pollen from the male structures of a plant to the female structures of another, enabling fertilization.

Reproductive Success

The passing of genes onto the next generation in a way that they can too reproduce effectively; a core concept of evolutionary biology.