Answer:
A. The mass extinction of dinosaurs occurred at the Cretaceous/Paleogene boundary.
Explanation:
The most known extinction is the associated with the Dinosaurs, which happened at the Cretaceous/Palogene boundary (66 million years ago), although there is still a huge discussion on the causes of such extinction (comet/asteroid, changes in sea level, volcano activity).
Such event meant the dissappearing of two-thirds of the living species on Earth.
<span>There are total 50 states in America.
Exception locations.-</span><span>The state of </span>Alaska<span> is in the northwestern part of North America (also bordering Canada) and the state of </span>Hawaii<span> is an archipelago in the mid-Pacific.
Hope this helps!</span>
<u>Answer:
</u>
It would be more accurate to calculate using only the arable land because only the arable can be surely said to be suitable for the cultivation of crops.
<u>Explanation:
</u>
- It is preferable to calculate the amount of agricultural yield that can be obtained from a specific area by taking into consideration only the land that is arable because the land other than arable land cannot guarantee the expected produce as it is not deemed to be suitable for farming.
- Arable land guarantees the expected produce owing to the fertility of the soil and the nutrients present in it that are crucial for the crop to thrive.
Due to it's great size, China is a land of contrast.
