According to the graph, which region is expected to reach a population of 50 million people in the year 2040?​

List five ways we are indebted to phytoplankton

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

Achange in direction without a change in speed is called velocity