1-3-2-4 here it is by birds u mean vulture right
This is apoptosis. in reference to sunburn, this is when cells die in order to protect you and your skin from damaged skin DNA (possibly cancer causing).
I would believe it is the Ozone but since it’s not an option the Ferrel Cell is the westerlies and the polar cell is the polar easterlies. So, I would say go with 4! Hope this helps, goodluck! xoxo.
ANSWER
D. a star hope this helps :)
It is a vestigial Structure.
Explanation: