In parts of Melanesia, pigs can be purchased using strings of shells, which cannot be used to buy any other goods or services. This is an example of __________.
A) special-purpose money
B) general-purpose money
C) bartered commodities
D) peasant money
Question 2
Why do most disciplines become more specialized as they grow?
A) Knowledge accumulates and methods become more advanced.
B) People get bored studying the same topics over and over again.
C) Theories fade out of use and more complex ideas must take their place.
D) Scientists today are simply more intelligent than scientists of the past.
Evolutionary changes in the shape of oyster shells.
Guinea pigs "social groom"
Parts of the stethoscope
Ocean acidification (shells missing)
Human Body Parts
If a meteor (148 kg) is moving with a velocity of 112 m/s , and breaks into two parts, where ...