How many miles is the earth away from the sun

How can you keep track of variables in a science experiment?

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

The spermists believed that: the male made the only hereditary contribution to the offspring the male and female traits were blended in the offspring the female made the only hereditary contribution to the offspring the male and the female made equal contributions to the next generation