When women experience cravings for different foods, it means that they experiencing a hormone related change which severely effects their sense of taste and other senses that can cause these kinds of cravings.
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You are right with your answer please
Down syndrome and Alzheimer's disease.
Down syndrome is a chromosomal disorder which is caused by the presence of extra copy of chromosome 21. Therefore also called as Trisomy 21.
Alzheimer's disease is a most common form of dementia(reduction in brain functioning). It is caused by mutation in single gene APP (Amyloid Precursor Protein) present on chromosomer 21.
I believe it is temperature or rainfall. All of the factors are improtant but temperature comes first, cuz the temperature can also determine the air, and soil doesn't make a difference. Longitude doesn't have to do with an ecosystem.