The answer is Speciation cannot occur in the absence of mutation. Speciation cannot occur in the absence of natural selection
I think D is the right answer.
Answer:
Explanation:
Water washed disease are diseased that occur due to lack of water for proper personal use.
Often common in areas with predominantly poor people.
Water borne diseases are disease that are are transmitted by pathogens and micro organisms in water. Bacteria and protozoan are major carriers of water borne disease. When exposes to contaminated water one could get the disease from there.
Both water borne and water washed diseased are characterized by pathogens and micro organism.
They both result in serious medical condition that requires treatment via drug administration.
Lack of proper hygiene can result in both water washed and water borne disease.
The ileum contains villi that project into the lumen and increase the amount of surface area.
Villi are small finger-like structures that project into the lumen of the small intestine. Villi increase the surface area of the intestinal walls for easy and quick absorption of digested food with the addition of digestive secretions. Villi vary in length from about 0.5 to 1 mm. They are usually found in large numbers at the beginning of the small intestine and they reduce toward the end of the tract.
