Question

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Answer 1

8...... If there are no platelets in the blood, then the blood would not be able to clot. A clot is formed because of platelets. They release blood clotting chemicals at the site of injury. These chemicals form a clot and prevent further bleeding.

7..
Some river water may look clear and drinkable, but it is likely to contain harmful organisms coming from one or more sources, e.g., treated sewage effluent (sewage treatment does not aim to produce drinking water but water that can be discharged to a river without upsetting the balance of aquatic life), industrial or agricultural processes, animals standing in the river and defecating, animal corpses, and so on. None of these necessarily produces visible evidence of its presence, and the organisms that could either kill you or make you very ill indeed are microscopic.

Answer 2

Answer:

Explanation:

(1) if they live near rivers and streams it dont mind because this water is not fit for drinking. It is contaminated water contains many impurities.

(2) if blood platelets are absent in our body then then the damaged part in body will be keep bleeding and infection can be caused because no jelly substance will be produced.

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