The wind is just strong enough to move the sand grains which were sorted by size by the wind. Heavier grains were left in place where as smaller grains were carried away. These grains kept moving till they were concentrated in one place usually up a hill. The grains climb the flat slope on the windward side and then fall off the steep side. The dunes may migrate slowly as this process continues, the grains at the upwind side climb the dune with the help of the wind and then fall down the downwind side.<span>
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<span>The building blocks for lipids are three fatty molecules and one glycerol molecule.They join to form a simple fat, or triglyceride. Proteins building blocks are amino acids. Amino acids are small molecules that contain carbon, hydrogen oxygen, and nitrogen atoms. Nucleic acids building blocks are nucleotides which are connected to form long chains,</span>
As a source of Cellular respiration .......
When limiting factors increase, diversity in populations decreases. In this sense "limiting factors" can be anything from a lack of resources to a lack of food, meaning it's harder for the population to survive.
