What is the role of the spindle during mitosis

It is basically a structure which helps segregate the chormosomes in to the daughter cells

hope this was helpful

its  a protein structure that divides the genetic material in a cell

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The open ocean begins at the low-tide mark and extends to the end of the continental shelf

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.