To receive oxygen. Basically to breathe.
vi. Water pollution occur when harmful substances like chemicals or microorganisms contaminate streams, revers, lakes and other water bodies.
vii. Causes of water pollution are: industrial wastes, oil pollution and acid rain.
viii. Contaminated water becomes unfit for consumption by humans and cattle. As the result, there is drastic reduction of the fish population. Water pollution results in increase case of water borne diseases like cholera, diarrhea, etc.
I hope this helps :)
<span>The cortex is the outermost layer of brain cells. Thinking and voluntary movements begin in the cortex.
</span><span>The occipital lobes contain the brain's visual processing system.</span>
Answer:
It's C. circular irrigation patterns
Positive - Due to urbanization, the people of rural areas settle in urban cites. These reduces the labour work which was done in rural areas and as they get water and electricity. The reduced labour work help them in maintaining their physical health
Negative - If people continues to enjoy the facilities and sit ideally doing nothing is much more worse than the above one. It causes obesity and can ultimately lead to heart attack
