Question

e. It occurs once in every four years.​

Answer 1

Answer:

Leap year

Explanation:

Leap year occurs once in every four years.

Answer 2

Answer:

29th February

Explanation:

There occurs leap year once in 4 years

'cause Earth takes 365 days and some hours to revolve around the sun and these hours are not counted every year but adjusted in the leap year as 29th February.