Final answer:
The very high incidence of microcephaly can be attributed to genetic mutations and environmental factors. OPTION A IS CORRECT
Step-by-step explanation:
The very high incidence of microcephaly can be attributed to two main factors: genetic mutations and environmental factors. Genetic mutations can lead to abnormalities in the development of the brain, resulting in microcephaly. Environmental factors, such as exposure to certain infections or toxins during pregnancy, can also increase the risk of developing microcephaly.
For example, the Zika virus is known to cause microcephaly in babies when a pregnant woman is infected. This is an example of how an environmental factor can contribute to the high incidence of microcephaly in certain populations. OPTION A IS CORRECT