Approximately How Long Has It Been Since the Last Magnetic

question 47

Multiple Choice

Approximately how long has it been since the last magnetic reversal?

• A) 1,780 years
• B) 17,800 years
• C) 780,000 years
• D) 1.768 million years

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Definitions:

Receptor Proteins

Proteins on the cell surface or within cells that bind to specific molecules, triggering a response in the cell.

Diffusion

The passive movement of molecules or particles from an area of higher concentration to an area of lower concentration, until equilibrium is reached.

Allergic Reaction

An immune response to a substance, known as an allergen, that is typically harmless to most people.

Osmosis

The movement of water molecules through a semipermeable membrane from a region of lower solute concentration to one of higher concentration.