Help please What is the correct term for digging tunnels deep into the Earth to reach a desired mineral?

surface mining

sub-surface mining

mountaintop removal

extraction mining

Which of the following is not a benefit of green revolution? a) new crop varieties b) increased crop yields c) cost effective d) new crops may require larger amonts of water than the previous ones.

List two limitations of natural selection

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?