It is known as the heritability of intelligence, The extent to which differences in intelligence among a group of people are attributable to genetic factors. Heritability is defined as the mathematical estimate that indicates how much traits in the population variation can be attributed to genes. The heritability of intelligence vary, and most of the researchers believes that heritability of intelligence is between 60 - 80 percent.
The sun has little or nothing to do with any of these answers except A. The sun gives plants energy, plants give animals energy, and animals give us energy. (Unless you're vegetarian in which case you skip the animal part)
The glucose and the oxygen travel out into the body through the circulatory system to reach cells that need energy. The cells use the glucose and oxygen from the circulatory system for energy production.
