The correct answer is C. Guilds likely became less powerful as artisans were replaced by machinery. During the Industrial revolution mass production allowed businesses to produce larger quantities using less capital. They needed less workers when they began incorporating machines that could not only produce more products quicker, but could also produce them uniformly. This meant that fewer artisans would have been needed to make certain products.
Scientists believe that increased pollution may cause global warming because pollution includes greenhouse gases, which trap heat in the Earth’s atmosphere.
Option B
<u>Explanation</u>:
When the average temperature of earth increases and rises continuously above the normal value for a long period of time the it is referred as global warming.
Human beings are major cause in increasing pollution by various means whether its chemical industrial metallic or any other type of pollution. The major contributing factor in aiding pollution is the smoke from factories or vehicles which increases the carbon dioxide level above normal and when these gases rises they are trapped inside the earth surface and produce a green house effect. This is the main reason that scientists think aboutglobal warming.
Sound wave is a pressure caused by the vibration of something in a medium that transfers anergy, like air.
Proceed with extreme caution