The Rock Record for Tens of Millions of Years Indicates

question 18

Multiple Choice

The rock record for tens of millions of years indicates that the Earth's magnetic field ____.

• A) reverses polarity about every 500,000 years
• B) is constant in strength and polarity
• C) did not come into existence until about 1 million years ago
• D) is a monopole magnet
• E) has steadily weakened and will be gone in another 10 million years

Describe the structure and function of the pharynx and its role in the respiratory and digestive systems.

Identify and describe the roles of the nasal structures in the process of respiration.

Understand the role and structure of the alveoli and microanatomy of the gas exchange surfaces.

Understand the concepts of respiratory volumes and capacities.

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