Which of the following is true about charcoal?
a.
it is made by mixing carbon and clay.
b.
it has been a main medium used by japanese artists throughout history.
c.
charcoal is difficult to work with and expensive.
d.
there are two forms of charcoal that are popularly used.

The correct answer is d.There are two forms of charcoal that are popularly used.

Charcoal is made out of wood and has little to do with clay. It has been used historically by artists, but it has not been a main medium of drawing or creating. It's not difficult to work with nor is it expensive, compared to other fossil fuels around.

1. antarctica2. saudi arabia

Ibelieve it is- a mixed economy offers some protection for consumer rights but still allows a good deal of choice.