The answer is Speciation cannot occur in the absence of mutation. Speciation cannot occur in the absence of natural selection
<span>If I were attempting to date a rock sample that I suspect to be incredibly old, i would use radioactive isotopes with a long half life. When dating rocks and fossils to discover approximately how old they are, radioisotope dating is used on igneous rocks found near fossils. Things like Uranium 235, which is an unstable radioactive isotope of elements, decays at a constant rate over time so can be useful in determining age.</span>
<span>Formation of bivalents lead to spindle fibers from opposite poles attaching to homologous chromosomes.
Hope this helps!!</span>
<span>dirty, contaminated, </span><span>polluted, unclean, </span><span>unsanitary, <span>unsterile.</span></span>
