Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth? 130 million years ago
1.5 billion years ago
2.5 billion years ago
4.1 billion years ago

What does the word submerged mean in the following sentence? after it rained for three days in a row, the streets were completely submerged.

How does the brandt line, walt rostow's modernization model, neocolonialism, and walterstein's world systems theory inform and intersect with each other when explaining economic development?

Which of the following expressions is equivalent to -1/4y - 2 1/4 + 1/2 (4-2y)? a. -3y + 2b. -3 1/2+4c. -4 1/2y+2d. -4 1/2y+2show ur work