SAMPLE ANSWER TO EXERCISE 1

Snakes attack larger animals like us when they are disturbed. These bites are not fatal as little or none of the venom is released. The full, deadly dose of poison is used to kill smaller animals for food. Snake venoms contain three types of poisons, usually varying in amounts There are substances that weaken the blood cells and walls of blood vessels; anticoagulants to prevent blood clotting, which results in profuse bleeding and toxins to paralyze the heart and respiratory muscles. When bitten by a snake, one should apply a broad bandage over the wound and up the limb to help compress the tissues and prevent the spread of the venom before sending the victim the hospital. ( 114 words )

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