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What organelle other than the nucleus houses dna in a eukaryotic cell?

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?