Question

) Give scientific reasons of any two of the following.
1) Astronauts on the moon cannot hear each other directly.
2) Blood donation is considered to be a superior of all donations.
3) Food must have limited amount of salt.​

Answer 1

here is the answer..hope it helps

Answer 2

1) Astronauts on the moon cannot hear each other directly.

Answer Sound requires medium to travel. The absence of atmosphere on the Moon makes it medium less. Thus, the astronauts on the Moon cannot hear each other directly because of the absence of the medium

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2) Blood donation is considered to be a superior of all donations.

Answer Blood donation is considered superior of all donations because it can save someome's life. Most of the lives are lost due to blood loss during surgeries, accidents or cases where regular blood transfusion is required. These lives can be saved, if adequate amount of blood is available.

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3) Food must have limited amount of salt

Answer Food must have limited amount of salts as we require limited amounts of these in our body. Excessive salts in food can lead to accumulation of water in different parts of the body such as arms, legs etc. and lead to edema. Too much salt leads to increase in the blood pressure as well.

hope it helps u:)