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Hydrogen sulfide as an energy source for chemoautotrophic bacteria in the deep sea.
In most ecosystems, sunlight provides the ultimate source of energy to power all biological activity
Play in Four Cultures Across cultures, play is the most common activity in early childhood. Source:
Age and Grammatical Knowledge The challenge of learning a second language rises with age. Source: J
Because vitamin A is stored in the liver, chicken liver is a potent source of this vitamin
Dried fruits are good source of sulfur