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fats that are solid at room temperature and are found in animals. They are thought to be linked to heart disease.
a condition that develops when a person has an unbalanced diet.
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...
a level an organism occupies in the food chain.
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
the bone-like substance beneath the enamel of the tooth.