Why do people need protected drinking water scheme?

Why some pepole do not have drinking water facilities eventhrough they reside near rivers and streams? Give yours reasons.

Why do we need proper drainage system?

When do a person need stent ?

Why do people need and observe weather?

Why do some people need to use a dialysis machine? Explain the principal involved

Why does a plant need water?

Consider the following four statements (i)-(iv) about certain desert animals such as kangaroo rat. i) They have dark colour and high rate of reproduction and excrete solid urine ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs iii) They feed on dry seeds and do not required drinking water iv)They excrete very concentrated urine and do not use water to regulate body temperature. Out of these four, which two are correct :

Why D_2O cannot be used as drinking water ?

Why do people living in hot and humid region wear cotton clothes?