Liver problems. Failing liver. Something with the hippocampus getting smaller, which will cause your memory to leave you.
No because they need water which comes from rain. Phototropism is the growth of an organism which responds to a light stimulus.
You can use a chromosomal karyotype to see if there are any abnormalities with the normal 23 pairs of chromosomes that every healthy human has. Different abnormalities like an extra chromosome (trisomy), missing a chromosome (Minos omg), or having certain parts missing or added on can lead to a person to be diagnosed with certain disease (ex: Down syndrome is an extra chromosome on the 21st chromosome).
Hope this helps!