Question

A) Give scientific reasons. (Any two)
1) The water in the seas and oceans is useful even though
it is salty.
2) We must observe economy in the use of materials.
3) Man-made substances have great demand.
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Answer 1

Answer:

3 : man made substances have great demand , because i) they are not formed naturally . and are very useful .

1 : water in the oceans and seas are salty, thus useful because i) export and imports are mainly done through sea routes. .........

thanks .........:)