Alimestone bed containing fossils that are 550 million years old is a bed of sandstone containing fossils that are 400 million years old.
a. younger than
c. older than
b. the same age as
d. not related to

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit