The phosphorus cycle does not include an atmospheric component because phosphorus does not cycle through the atmosphere. In comparison, important processes of the carbon and nitrogen cycle occur in the atmosphere.
<u>Answer:</u>
Cyanobacteria start producing pure oxygen around 200 million years ago.
<u>Explanation:</u>
Many scientists believed that Earth did not have any oxygen. Cyanobacteria or the blue green algae are the microbes which produced oxygen for the first time with the help of photosynthesis. This was around 4.5 billion years ago: after Hadean eon.
They were very simple, but they produced oxygen in the early earth’s atmosphere. So, they brought evolution on earth. This “blue-green algae” exists in salt water, rocks and soils and play a major role in maintaining the ecosystem.
The cell because they are moving from high to low concentration
The development of electronic delivery systems advancements in the music industry has preserved resources and reduced waste.
Option C
<h3><u>Explanation:</u></h3>
Music industry is the industry that deals with the production of new music that are soothing to hear, recording them, spreading them in public and so on. This industry is an age old industry which used to record music in different ways in past. Most of them were not that efficient to capture the individual tunes of the music and moreover they used the resources very inefficiently.
With the advent of modern day electronic delivery systems, the mics came into market, as well as different electronic media like pendrive, CD's, tape recorders, and even internet through which music can be spread among public very easily.
