Four Geography problems I am having a lot of trouble with, please help!!?

Question

1. The six climate regions into which geographers have divided the earth were defined mainly by

A) latitude and elevation.

B) temperature and precipitation.

C) atmospheric pressure.

D) location and landforms.

2. What region was the culture hearth for most of East Asia?

A) the United States

B) modern Japan

C) Teotihuacan

D) ancient China

3. By which of the following are modern economic systems distinguished from one another?

A) means of production

B) kinds of goods and services produced

C) amount of investment capital

D) degree of government involvement

4. What information would be least helpful in measuring the economic development of a country?

A) how people in the country earn a living

B) the country's climate

C) the gross national product of the country

D) the per capita GNP of the country

Thanks in advance for the answers, please answer only if you are sure, and want to help me!!!!!

Answer 1

The answer for 4 is B.  That's the only one I know, sorry!

Answer 2

1. A

2. D

3. B and D (depending on type of market being described)

4. B

-pph

Answer 3

1.  B

2.  D

3.  C

4.  B