<span>Mass extinctions when at least half of all species die out. The largest mass extinction event occurred around 250 million years ago, when perhaps 95 % of all species went extinct. Now new ones appeared.
It was during Cretaceous.
Hope this helps !
Photon</span>
The land was shaped like a crescent and the soil there was fertile.
im not sure of the answer but i know that it is not B. but my guess would be C.
not sure if this what you mean, but quality of life is if someones life is worth living and if it's keeping to the standards of a normal, fit life.
1. B 80 feet
since the contour lines go by 25 B is between 75 and 100 and the only option left is 80
2. C 135 feet
point X is above 125 feet in elevation already and the only option is 135
