If the Age of the Earth Is 4

question 95

Multiple Choice

If the age of the Earth is 4.5 billion years and the half-life of ⁴⁰K is 1.26 billion years,what percent of the Earth's original amount of ⁴⁰K remains today?

• A)4.2%
• B)8.4%
• C)12%
• D)16%

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Definitions:

Adaptation

The evolutionary process by which organisms become better suited to their environment, leading to changes in their structure, behavior, or physiology.

Fly

A small, winged insect belonging to the order Diptera, known for its ability to fly quickly and its role in various ecosystems as both pollinator and decomposer.

Thyroid Hormone

Iodine-containing hormones that collectively increase metabolic rate and play a role in development.

Thyroid-Stimulating Hormone

Anterior pituitary hormone; stimulates secretion of thyroid hormone by the thyroid.