Which of the following is evidence that an area was once covered by a glacier?
a. loess deposits
b. v-shaped valley
c. u-shaped valley
d. alluvial fan

The correct answer is letter B. V-shaped Valley. It is the evidence that an area was once covered by a glacier. Glaciers form in an area where the temperature is so very low and stayed there for a longer time. Glaciers that reached the oceans form icebergs.

Mexico has a host of environmental problems, including significant chemicalpollution  from factory discharges and waste dumping, but the main threat to itsbiodiversity  probably stems from  deforestation  and other natural habitat losses. forest habitat is lost for a number of reasons

We can not answer this question because we cannot see the graph,sorry< 3