If a Pregnancy Test Can Detect Pregnancy Within Two Weeks

question 173

Multiple Choice

If a pregnancy test can detect pregnancy within two weeks after fertilization, it most likely works by:

• A) detecting the hormone human chorionic gonadotropin in the woman's urine
• B) detecting a rise in the woman's body temperature from 98.6 to about 99.3
• C) detecting the presence of a much higher percentage of alpha brain waves during the woman's sleep cycles
• D) detecting a dramatic increase in the acidity of the woman's urine

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Definitions:

Predators

Organisms that hunt, kill, and consume other organisms for food.

Obscure

To make something difficult to see or to make unclear, either literally by blocking light or figuratively by being difficult to understand.

Chordates

A large phylum of animals that includes all vertebrates as well as two groups of invertebrates, characterized by having a notochord at some stage of their development.

Ediacaran Fauna

Ediacaran fauna is a group of animal species that existed during the Ediacaran period, just before the Cambrian. The oldest Ediacaran fossils are about 570 million years old. Ediacarans included diverse species that looked like fronds, geometrical disks, and blobs covered with tire tracks. They appear to have become extinct 540 million years ago, although some researchers argue that certain Ediacaran taxa belong to extant animal clades.