Answer: protons
Explanation: atoms of each element contain a characteristic number of protons
DNA replication is semi-conservative because only one half of the DNA helix is replicated
Answer:
D. reproduction
Explanation:
If the species doesn't reproduce they die out or become extinct.
Describe<span> how </span>eukaryotic cell's chromosomes change as a cell prepares to divide<span>. Before </span>cell<span> division each </span>chromosome<span> is replicated. At the beginning of division each </span>chromosome<span> has two daughter chromatids. ... A scientist treats </span>cells<span> with a chemical that prevents DNA synthesis.</span>
