Which type of coal has the highest energy yield, and which type of coal is the most common in the united states.

Bituminous coal is most common in the U.S.A. but Anthracite has the highest energy yield.

Coal that has the highest energy yield is anthracite. Also known as hard coal, it has a high carbon  content approximately 98% and few impurities. This type of coal is mostly found in the eastern part of the USA, and small amounts can be found in South Africa, Australia, China and Canada.

The type of coal most common in the United States of America is Bituminous, this type of coal is used to generate electricity and make iron and steel. It is also called soft coal, it is a sedimentary rock formed through chemical and physical changes of the sediment rock  as well as sub metamorphic compression of peat bog material.

Explanation:

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )

the answer is d.) homologous; have mammary glands