What are the factors that cause evolution to occur?

Answer 1

The two main factors are mutation and natural selection.

Mutations are random changes in our DNA that cause changes. Some of these changes are bad, some are neutral, and some are good.

This is where natural selection comes in. If the mutation is bad, then that organism is less likely to mate and pass down the gene. The organism dies along with the mutation that made it less fit. If it is neutral, which is what most mutations are, then nothing happens. If it is good, then the organism is more likely to survive and pass down the gene which will then propagate through the species.

Answer 2

Evolution occurs due to factors such as natural selection, genetic drift, gene flow, mutations, and environmental changes. These factors drive changes in the frequency of traits within a population over time, leading to the emergence of new species and adaptations.