What is the main way scientists measure the extent of snow and ice cover in the
Arctic and Antarctic?
A. data collected from boats
B. photographs taken from helicopters
C. images taken by satellites
D. estimates developed by computer
models

Would really appreciate it, i have an idea but not completely sure

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity