In a Ten- Billion to One Scale Model, the Sun

question 65

Multiple Choice

In a ten- billion to one scale model, the Sun and the Earth are about the size of

• A)a grape and a grain of sand.
• B)a grapefruit and a grape.
• C)a grapefruit and a grain of sand.
• D)a basketball and a grape.

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Definitions:

Hypothalamus

A brain structure, located just above the brain stem, that performs a number of important tasks, including the regulation of hunger, thirst, and sexual desire, and connects the nervous system to the endocrine system.

Gonads

The primary reproductive organs that produce gametes (sperm in males, ova in females) and sex hormones, including testes in males and ovaries in females.

Secondary Sex Characteristics

The anatomical and physiological signs that outwardly distinguish males from females.

Menarche

The first occurrence of menstruation in girls, marking a significant milestone in female puberty and reproductive maturity.