Trait variations occur in all populations. In what way do trait variations affect the overall population? a. When neutral variations are passed on to the next generation they benefit the population
b. When harmful variations are passed on to the next generation, they have very little effect on the population
c. When variations occur, they change the way genes are passed along in a population
d. When helpful variations are passed along to the next generation, the offspring are more likely to survive and reproduce, which benefits the population