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Piaget believed that children began to understand the concept of object permanence beginning around the age of
Phase
A distinct period or stage in a process of change or forming part of something's development.
Male
Relating to the sex that in species with sexual reproduction is typically associated with XY chromosomes, producing sperm, and characterized by certain physical features.
Female
Refers to the sex that is typically associated with producing ova or eggs and has reproductive anatomy which includes structures such as ovaries and a uterus in mammals.
Parental Investment Theory
A theory in evolutionary biology and social science that explains parental expenditure on offspring, in terms of costs and benefits to the offspring's chances of survival.
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