The cell theory includes these important ideas: All living things are made of cells. The cell is the basic unit of structure and function in all organisms. Every cell comes from another cell that lived before it. The nucleus is the core element of the cell. Cell reproduction
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The second thing is that some programs will allow you to select the 'inches' you need for the canvas. However usually if you're using 150 pixels per inch then for 5 inches by 7 inches it should be 1050 pixels by 750 pixels. Because 150 pixels x 5 inches = 750 and 150 pixels x 7 inches is 1050.Similarly when you use 300 pixels/dots per inch the dimensions will be 2100 pixels by 1500. This is of course because the pixels in each inch depend on the amount of pixels in each inch.So you just multiply the pixels per inch and the number of inches to derive the number of pixels.Hope this helps.owever usually if you're using 150 pixels per inch then for 5 inches by 7 inches it should be 1050 pixels by 750 pixels. Because 150 pixels x 5 inches = 750 and 150 pixels x 7 inches is 1050.