Answer:
Where are the answer choices???
Explanation:
the world's current population is 7.3 billion and the world population in 1915 was 1.8 billion. The increase over the past century is 7.3 billion - 1.8 billion = 5.5 billion. So, the correct answer would be "more than 5 billion" (option D).
I would either answer sanitation(pollution) or corruption
A possible cause was a meteorite hit the earth. it caused many organisms to become extinct because it blocked out the Sun so plants couldn't grow and herbivores couldn't eat the plants and carnivores couldn't eat herbivores.
The correct answer is: B. Global warming.
The construction activities have much increased problems at the permafrost regions recently. The main reason for that is the climate change, or rather the global warming. Because the temperatures have increased, the permafrost is melted for certain parts of the year, while on others is slowly disappearing. That causes lot of movement and adjustment in the landscape. The previously constructed infrastructure has been damaged, on some places totally ruined. The permafrost is not stable anymore, thus the previous methods of construction are not suitable, so there's a very big problem when something needs to be constructed in this regions nowadays.