(adapted from the Yahoo! Kids Dictionary and other sources)
fossil A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded and preserved in the Earth's crust.
prey An animal hunted or caught for food.
paleontology The study of the forms of life existing in prehistoric or geologic times, as represented by the fossils of plants, animals and other organisms.
shock A potentially fatal bodily reaction to a variety of conditions, including illness, injury, blood loss and lack of adequate water, usually characterized by marked loss of blood pressure, decreased blood circulation and inadequate blood flow to the tissues.
gland A cell, a group of cells or an organ that produces and discharges a substance (or secretion) for use elsewhere in the body or in a body cavity, or for elimination from the body.
venom A poisonous secretion of an animal, such as a snake, spider or scorpion, usually transmitted by a bite or sting.