In a food web there is a hierarchy, if any one of the parts of a food web is changed it can effect the parts above that may consume it, or the parts below that it may consume. Since the food web relies on balance and a hierarchy, if something changes it could disrupt the balance and flow of energy in the food web.
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Explanation:
Well a person can be asymptomatic for loads of viruses not just coronavirus. There is no way of knowing if someone is asymptomatic without having a test done. Many asymptomatic people will go on to get a test and then show symptoms a few days or so later.
Bird and egg drop experiment are similar in nature. When the birds fly and have wings they slow down when they are landing. Relating to human activities, egg drop is also like skydiving. The parachute is blocking the air and it slows down when dropping.
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They serve us as shelters.
It protects us from many natural hazards like, rain,heat etc.
It provides a privacy to every person.