The Oldest Rocks on Our Crust Are Radioactively Dated at About

question 14

Multiple Choice

The oldest rocks on our crust are radioactively dated at about:

• A)200 million years old.
• B)one billion years old.
• C)2.7 billion years old.
• D)four billion years old.
• E)4.6 billion years old.

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Definitions:

Heritable Trait

A characteristic that is genetically passed from parents to their offspring.

Sexual Reproduction

A biological process that involves the combination of genetic material from two parents to produce offspring with genetic variation.

Hermaphroditic Flower

A flower that contains both male (stamen) and female (pistil) reproductive structures, allowing it to self-pollinate or cross-pollinate.

Self-Fertilization

The process by which an organism fertilizes itself without the genetic contribution from another individual, common in some plant species and invertebrates.