You Discover a Binary Star System in Which One Star

question 53

Multiple Choice

You discover a binary star system in which one star is a 15 MSun main- sequence star and the other is a 10 MSun giant. How do we think that a star system such as this might have come to exist?

• A)The giant must once have been the more massive star, but is now less massive because it transferred some of its mass to its companion.
• B)The two stars are simply evolving normally and independently, and one has become a giant before the other.
• C)The two stars probably were once separate, but became a binary when a close encounter allowed their mutual gravity to pull them together.
• D)Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main sequence stars millions of years later than its less massive companion.

Understand the methods used by Great Britain and the United States to expand their markets and influence abroad.

Recognize the implications of labeling certain responsibilities by colonial powers, specifically the concept of the "white man's burden."

Explain the status and rights of "nationals" in US territories and their implications on citizenship and privileges.

Analyze the motivations behind the United States' aggressive foreign policies at the turn of the century.

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Definitions:

Urine Concentration

The process by which the kidneys regulate the water content and solute composition of the urine.

Urea

Urea is a nitrogenous compound produced in the liver as a waste product of protein metabolism, excreted in urine.

Collecting Ducts

Channels within the kidneys responsible for gathering urine from the nephrons and moving it towards the renal pelvis.

Distal Convoluted Tubule

A portion of kidney nephron between the loop of Henle and the collecting duct system where selective reabsorption and secretion occur, influencing body's electrolyte and fluid balance.