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Researchers analyzing the long-term effects of some early childhood intervention programs have found that adolescents who had taken part in these programs as children
Chloroplast
Organelles in plant and algal cells where photosynthesis takes place, converting light energy into chemical energy.
Organelle
One of the specialized structures within the cell, such as the mitochondria, Golgi complex, ribosomes, or contractile vacuole; many organelles are membrane-enclosed.
Geologic Time Scale
A system of chronological dating that relates geological strata to time, used by geologists and other Earth scientists to describe the timing and relationships of events in Earth's history.
Eon
The largest division of the geologic time scale; eons are divided into eras.
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