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What technique did Mary Ainsworth develop to measure the infant's attachment to the caregiver?
Hydrocarbon
is an organic compound consisting entirely of hydrogen and carbon atoms, commonly found in fossil fuels and as the basis of various organic substances.
Petroleum
A naturally occurring liquid found beneath the Earth's surface that can be refined into fuel and various chemical products.
Commercial Energy
Energy that is produced and sold commercially, often in the form of electricity, natural gas, oil, and coal.
United States
A country in North America composed of 50 states, a federal district, five major self-governing territories, and various possessions.
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