South africa once (colder/warmer) than it is today.

Glacial striations have been found in South America, South Africa, India, and Australia. What do these marks tell scientist?  

that these areas have not seen much of a change in climate over the years

that these areas were once home to plants and animals that do not live there today

that these areas were once much colder than they are today

that these areas were once much warmer than they are today

Explanation:

Answer that these areas were once much colder than they are today

As glaciers move, they trap and drag rocks beneath them. The grooves that result in the underlying landscape are called glacial striations. Glacial striations have been found in areas of the world that are not currently covered in glaciers, but which must have been covered in ice sheets at some point

the money supply is the total amount of money available in the economy. how do changes in the money supply affect people and businesses?

the answer is:

c. economic output