There is a broad consensus among experts that IQ is determined by a combination of genetic and environmental factors. Genetic factors are believed to contribute to about 50-80% of the variation in IQ scores, while environmental factors, such as upbringing, education, and socioeconomic status, play a significant role as well. It is important to note that IQ is not a sole measure of intelligence and there are different types of intelligence that may not be fully captured by IQ tests. Additionally, IQ can also be influenced by factors like nutrition, health, and access to educational resources.
