The one word substitute for "a person who is always dissatisfied" is malcontent.

Tadpole is the larval stage in all the amphibians whereas larva in all the insects.

Computer memory - ROM is essentially empty. ROM is a Read Only Memory which cannot be retrieve.

To find the LCM of 24, 36 and 40

24 = 2 x 2 x 2 x 3

36 = 2 x 2 x 3 x 3

40 = 2 x 2 x 2 x 5 

Now, LCM of 24, 36 and 40 = 2 x 2 x 2 x 3 x 3 x 5

= 8 x 9 x 5

= 72 x 5

= 360

Polyunsaturated fats are healthy fats whcih we can get from eating greeny leaf vegetables, fish and some seeds that are helpful in brain functioning, nutrient rich blood, hair growth, etc...

Harappa was the earliest city discovered in India.