The people who lived in the rural areas faced the difficulties to get the portable water because they uses the water from the unprotected ponds and tanks, wells, cisterns, streams and rivers .
<u>Explanation:</u>
They used the unprotected water for drinking, bathing, washes clothes and livestock washing. The lack of infrastructure and facilities to monitor and maintain the adequate water quality .
It is essential to examine the quality of the drinking water used by the rural communities. The drought prone areas that lack a proper waste supply infrastructure.
I think the answer to this question would be letter A. Amphibians
1. A disease cause by a very small genetic change. Most cases result from the deleting of three bases in a gene for a protein called cystic fibrosis transmembrane changes which in a gene's DNA sequence can change proteins by altering their amino acid sequences which may affect one's phenotype.
2. It causes a mutation in the number of chromosomes, either extra chromosomes or missing chromosomes. Nondisjunction during meiosis can cause chromosomal disorders , such as a trisomy 21 (down syndrome) , Tuners syndrome , and Klinefelter's syndrome. It is a monosomy of the X sex chromosome.