Whale blubber was once used by many countries to make lamp oil and other products. Because of the usefulness of whale blubber, huge numbers of whales were caught and

killed in the 1800s. As a result, the whale populations around the world severely

decreased. In the late 1800s, electric lights were introduced in many cities.

Which statement correctly describes the change from whale oil lamps to electric lights.

a

b

Analyzing the costs and benefits proved electric lights to be the better choice.

The benefit of using whale oil lights outweighs the benefit of using electric

lights..

Whale populations decreasing was a large benefit.

Analyzing the costs and benefits proved whale oil to be the better choice.

с

d

answer: mining of copper is a good thing because ,it is not carcinogenic to environment.copper resources are estimated at nearly 5.8 trillion pounds of which only about 0.7 trillion pounds (12%) have been mined throughout history.yes copper is the best metal for conducting electricity as it is used in electric wires.if someone falls into a mine he or she may get hurt if they do not wear any safety equipments or fall accidently, it depends on how shallow or high is the mine . the actual cost of a dump truck varies significantly depending on the truck itself, with a range between $100,000 to $150,000 for a new purchase, and a drastic swing between $15,000 to $100,000 for a used purchase.

if this answers you, vote and give .

explanation:

b

because the standard of living varies from region to region