Sex Matures -

: While biological maturation differs, studies on cognitive abilities often show "invariance," meaning the underlying structure of mental abilities matures similarly across both sexes.

Differences in maturity age can lead to skewed sex ratios on spawning grounds; if one sex matures later, fewer individuals survive the return migration. 4. Human Development and Invariance sex matures

: Environmental factors like prey availability, water temperature, and energy allocation are primary drivers of when an individual matures. : While biological maturation differs, studies on cognitive

: Individuals mature first as females and later transition to males. : Some research suggests females may show early

Sexual maturation is a critical life-history trait with major fitness consequences.

: Some research suggests females may show early advantages in processing speed and short-term memory, while males may show later advantages in visual-spatial abilities starting around age eight. 5. Environmental and Genetic Factors