He helped with the black people aswell anyways Rosa parks
The switching from old gas guzzlers to more fuel-efficient cars is an example of substitution effect.
Substitution effect is the switching of customer from a more expensive product to a cheaper product. This is usually because of an increase in price or a decrease in the customers income.
Substitution effect can be positive for consumers if they can continue to by the products they like. Also, this effect can be negative for consumers if it results in fewer choices of that product or products of lower quality.
Find out more at: brainly.com/question/22079450
B) 4 Amplitudes while the waves travels 1 wavelength and completes 1 period.
Natural gas is comprised of methane with small amounts of ethane,propane,butane and pentane.
The simpler molecular structure of natural gas enables a clean burn, so it's combustion does not produce solid particles or sulpher. It is used for heating,cooking,electricity generation and fuel for some cars.
<span />
