Shells were used as money once but would not as well as money today because
a. it would be difficult to persuade anyone to accept them as money.
c. they are fragile.
b. they are not scarce.
d. all of these.

When something is moving, it is in motion. pressing the gas pedal in a car will put the car in motion. two important properties of motion are speed and direction. speed is how fast an object is moving. tony and tanya both run for the same amount of time, in the same direction. tanya runs much further than tony in that time. how does tony's speed compare to tanya's speed? a) their speed is equal. b) tony is slower than tanya. c) tony is faster than tanya. d) without a stopwatch, you can't say for certain.

Lava and other matierls luanced from a volcano and into the air are referenced as

Which article of the us constitution addresses the issue of interpeting the laws of the united states