Why is an extra day added to the calendar every 4 years? A. Earth's day is actually less than 24 hours long. B. Earth's day is actually more than 24 hours long. C. Earth's year is actually less than 365 days long. D. Earth's year is actually more than 365 days long. Halpp pwease! :>

Explanation:

Earth's year is actually more than 365 days long. It is 365.25 days long. The .25 results in an extra day after four years

"a scientist studying a whale and its surroundings would need to understand the structure of atoms in case something was negatively affecting the whale or its surroundings."

explanation:

this was from the link provided:

answer; 60-100; beats per minute