How do organ systems work together to maintain homeostasis

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

What form of anesthetic was used for field surgery

People with one sickle cell allele are not likely to get malaria. what is this an example of?