Water is a significant component of the climate. Man can't survive without it. Along these lines, its another name is life. Be that as it may, dirtied water is exceptionally perilous for us. At present arsenic defilement in drinking water is one of the server issues of Bangladesh. In science arsenic is alluded to as a fiercely poisonOus white compound of weak component. Arsenic in ground water is available in Overabundance of as far as possible set for Bangladesh. The fact that arsenic can cause genuine makes it presently settled wellbeing danger. The rustic individuals of Bangladesh are for the most part reliant upon hand tube-wells for drinking water. The ground water was. before, viewed as a wellspring of safe drinking water. Tragically, it is, presently polluted by arsenic. Until 1970s in areas where the drinking water? supply contains perilous degrees of arsenic, the quick concern is finding a safe source of drinking water. There are two main choices; tracking down another protected source, and eliminating arsenic from the defiled source. Regardless, the drinking water provided should be liberated from destructive levels of arsenic, yet additionally from bacteriological defilement, and other compound toxins. So we all ought to approach to take care of the issue of arsenic.
Online classes and traditional classes paragraph for hsc or class 11,12 In our country online classes are of recent origin. Previously, we were accustomed to adopting traditional classes of person to person education. In fact, to cope with the modern world, we have no other alternative but to take recourse to online system of education. In this process, students can have the chance to be acquainted with the basic knowledge of computer, laptop, internet etc. Online system includes several types of media that provide the learners and teachers with text, audio, images, animation and streaming video. Through the online system learners can get all their necessary information. This information makes the students' learning perfect. In a word, we can say that in the present context, online system is the best one. But in our country online system has not been introduced in all educational institutions. Most of the institutions are still running with the traditional education system. In the
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