Answer: the need of evolution
Explanation: Charles Darwin saw the differences between the birds beaks in the Galapagos island. The beaks were different because of the different food that the environment provides.
In fact, the concordance rate of autism spectrum disorder was twice in identical twins that of non-twin siblings.
It has been shown that genetic has a huge influence on the development of autism spectrum disorder and that autism in identical twins was 13 times that of the general population. This suggest that environmental factors in the womb are the major factors that contribute.
The electrons are used to generate ATP and its equivalent forms.