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two species that interact symbiotically in a relationship that is beneficial to both species.
a large tongue-shaped organ in the mammalian body which secretes hormones and digestive enzymes...
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
informal, local knowledge that has been built up over the centuries by the people who live in a...
a method of ordering the age of different fossils, relative to each other, without working out...