In sexual reproduction, genes from two different beings are mixed and create a new individual from the mix of those two polls of genes, that means that every new individual that is born by sexual reproduction, is in fact the mix of two predecessors, so we can´t have two individuals with the same genes, not even brothers, cause even brothers have different genetics cause of the way that the genes are mixed.
<span>When the microscope was invented, it helped the cell theory. This invention allowed scientists to see that everything was made up of cells and see what cells do. They needed this invention in order to see that cells existed and study them more in depth.</span>
