Agroup of different organs that work together are called what

Which type of respiration takes place when there is no oxygen present

Select the word from the list that best fits the definition a system made of 25 satellites

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