The correct answer is A) Generates new combinations of alleles upon which selection can act.
Explanation:
In biology, there are two main kinds of reproduction: sexual and asexual. Asexual reproduction occurs when there is only a parent involve and this divides, splits or similar to form new cells or organisms that are genetically identical to the parent. On the other hand, in sexual reproduction, there are two parents involved, usually from opposite sexes and the alleles of both are combined in the offspring. The main advantage or benefit of sexual reproduction is that it involves the combination of alleles which means genetic variation, this makes the population able to adapt and evolve as selection acts and also makes a population less vulnerable to diseases. Thus, a benefit of sexual reproduction is that "Generates new combinations of alleles upon which selection can act".
Hubble's brilliant observation was that the red shift of galaxies was directly proportional to the distance of the galaxy from earth. That meant that things farther away from Earth were moving away faster. In other words, the universe must be expanding.
