I'm pretty sure it's A
Explanation:
I did a few quick Google searches on ap classes because I myself do not take them a I read that most colleges do take ap classes as credit. it's no guaranteed however as it says many, not all. and for C I looked it up and I'm assuming they can be taken anywhere. take what I say with a grain of salt though because like I said I just googled it, hope it helps though.
United Nations estimates that the population of developed countries between now and 2025 will grow more slowly than in developing countries.
By the year 2050, the worlds population is projected to reach 9 billion people.
According to a report by the United Nations, the current world population of 7.6 billion is expected to reach 8.6 billion in 2030, 9.8 billion in 2015 and 11.2 billion in 2100. Besides, The biggest increase in population is estimated to happen in Africa, and Asia.
Answer:
Cold air sinks. So by heating the cold air at the bottom it is more efficient and creates an updraft and circulates the air better than if it were heated at the top.
The different forms a gene may have for a trait are called alleles. they determine the hereditary characteristics of an offspring gains from their parents.
hope this helps :)
