Identify 2 ways organisms reproduce

Which of the following is not a characteristic of natural selection? 100 points pls more offspring are born than will survive to reproduce. mutations appear randomly breeding pairs are chosen by humans organisms that are better adapted are more likely to survive

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

What will happen if two of the base pairs of the stand of the dna are switched