What would happen if we did not have either an ozone layer or magnetic field around the earth

Where can dna be found in a prokaryotic cell

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele