What the missing numbers in the sequence -3,-2,__,__,1 ?

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

What was on result of the potato famine

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire