puits (1) association (1) Amérique du Nord (1) mortalité (1) famille (1) effet (1) enfant (1) Amérique du Nord (1) Testing (1) Mortality (1) Development (1) Reproduction (1) Children (1) Control (1) Death (1) Variations (1) Testing (1) Success (1) Space and time (1) Social groups (1) Scandinavia (1) Resource allocation (1) Reproduction (1) Parents (1) North America (1) Mortality (1) Investments (1) Impact (1) Grandmothers (1) Fertility (1)