The Age at Which Puberty Arrives Dropped Quickly Throughout the 20^th

question 17

Multiple Choice

The age at which puberty arrives dropped quickly throughout the 20^th century.What might account for this change?

• A)greenhouse effects on climate
• B)improved health and nutrition
• C)less manual labor requirements for adolescents
• D)trace amounts of radiation from electric appliances

---

Definitions:

Shoulders When Prone

The position and alignment of the shoulders while lying face down.

45-90 Degrees

A range of angles often referred to in various contexts, such as in geometry, physics, physical therapy, and ergonomics, implying a spectrum from acute to right angles.

Months

Units of time in calendars, typically involving a period of approximately 30 days or four weeks.

Hold Bottle

The action of supporting a feeding bottle during infant feeding to control the flow of milk or formula.