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.
I did my research on this question. It would be... D
Answer: the letter C and D represents chambers of heart
Explanation:
D represents right ventricle
<span> 56 miles south of </span>Baghdad<span>, next to the Euphrates River,in the country Iraq.</span>
