The image below shows a coherer from the 1890s, the first type of device able to receive radio waves. When a radio signal was received by the coherer, the small metal pieces inside would cling together and allow a current to pass through. The current would trigger a bell or a pen attached to a paper strip which would make a record of the signal.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este

ok whats the question if not i cannot you i need question and need a thing to answer