Answer:
to avoid mutations and other issues that may occur
I believe the answer is During<span> prophase
</span>The nucleus during mitosis. Micrographs illustrating the progressive stages ofmitosis<span> in a plant cell. </span>During<span> prophase, the chromosomes condense, the </span>nucleolus<span>disappears, and the </span>nuclear envelope<span> breaks down. At metaphase, the condensed chromosomes </span>
By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other. Often we can work out how and where they lived, and use this information to find out about ancient environments.
The theory is the Continental drift, the super-continent is called the Pangaea.