Describe why it is essential for dna to replicate prior to cell division

Blood made up of red and white blood cells work together to form

How can you approximate the number of calories required to keep you in energy balance?

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