Plz anwser immetataly What was the main reason ancient China's culture developed in isolation for thousands of years? Group of answer choices

a. Fear of disease

b. Threats from outside invaders

c. The surrounding physical features

d. The Great Wall

Why did large numbers of african migrate to the americas

How much water is in the ocean in cubic kilometers

Match the graph type to its description. 1. uses symbols to describe information pie 2. compares different quantities at the same point in time line 3. compares increases and decreases in a quantity over a period of time bar 4. shows the relationship of parts to each other and to the whole pictograph