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the area that occurs between the high water and low water marks. It is exposed to the air at low tide and covered by water at high tide.
extremely small infectious particles that can only reproduce inside a host cell.
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....