Decomposers are necessary in the food chain because they return nutrients to the ecosystem (2)
................... and living organism together make up THE SOIL.
Soil is the uppermost layer of the earth in which plants grown. It usually have a dark or brown coloration as a result of the decaying organic materials which it contains. There are different types of soil depending on the type of particles which they contain, but the best soil for agriculture is loamy soil.<span />
A large sample size broadens the range of possible data and forms a better picture for analysis. It also shows that data was not a flaw, for example if he only used a few plants, people would think that those plants were not very accurate. But, a large sample makes it more reliable and trustworthy.
The cells in a developing embryo
