Answer:
Ordovician extinction
.
Explanation:
The Ordovician extinction was an event that occurred around 450 million years ago and caused the <u>disappearance of 60% of marine species.</u>
This event was caused by global cooling which resulted in the <u>drop of the sea level</u>. This change mostly affected the species that developed life in the deep, depriving them of their natural habitat.
Earth is closest to the sun at a point called perigee.
The point at which the Earth is farthest from the sun is called the apogee, just in case you needed to know that one too.

(simplify the equation)

(subrtact both sides by 14)


(multiply both sides by 6)

Hope it helped,
Happy homework/ study/ exam!