Why does a cell make a copy of its dna before it divides?

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

The pacific plate is an oceanic tectonic plate. how did a hot and the pacific plate interact to form the hawaiian islands?

Which group of protists would be most likely to have cilia as adults and why? (1 point)the sporozoan protists would since they have to spread their spores around.the heterotrophic protists would since they use them to gather food.the parasitic protists would since they need to find other organisms to attack.the autotrophic protists would since they must move to find light.