The M phase of mitosis and M phase of meiosis both occur after interphase.However, the two processes differ in the arrangement and behavior of their chromosomes<span>. ... The pairing up of homologous </span>chromosomes<span> and crossing over only </span>occur<span> during </span>meiosis<span>.</span>
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The higher biodiversity in an ecosystem means that there is a greater variety of genes and species in that ecosystem. A great variety of genes and species means that the ecosystem is better able to carry out natural processes in the face of external stress. Thus, the ecosystem is more sustainable.