One factor that has led to increased populations in dry areas is there is better technology that allows easier access to water supplies. The correct answer is C.
The last one is right answer i think
Because it maybe didnt get enough water or the seeds were different.
Answer: phenylketonuria is caused by a deficiency of phenylalanine hydroxylase
Explanation: deficiency of Phenylalanine hydroxylase leads to inability of amino acid phenylalanine to be converted to amino acid Tyrosine. Deficiency of phenylalanine hydroxylase is caused by mutation in the genes that code for phenylalanine hydroxylase