Answer:
1. Offspring survive chances.
2. chance of survival of the organisms
3. Increase the odds of a spontaneous variation
Step-by-step explanation:
1.While external fertilization is not further divided into any further types. The advantages of internal fertilization are, offspring survival chances are enhanced within the safe environment inside the body of the mother. Chances of successful fertilization are also enhanced.
2. The main advantage of genetic variation is that it increases the chance of survival of the organisms. The nature always selects the fittest organism. So if there was no variation in genetic make up of the organisms, there would not have been so many species of the organisms living in this world.
3.When more offspring are produced, it increases the odds of a spontaneous variation. A variation could be a genetic advantage, such as a bird with brighter colors who is able to attract more and better mates. Over time, multiple variations could lead to the creation of a new species altogether.