Egg-laying Mammals. There are only five living monotreme species: the duck-billed platypus and four species of echidna (also known as spiny anteaters). All of them are found only in Australia and New Guinea. Monotremes are not a very diverse group today, and there has not been much fossil information known until rather recently. In some ways, monotremes are very primitive for mammals because, like reptiles and birds, they lay eggs rather than having live birth. In a number of other respects, monotremes are rather derived, having highly modified snouts or beaks, and modern adult monotremes have no teeth.
The Ribbon contains multiple tabs, each with several groups of commands. You will use these tabs to perform the most common tasks in Excel. Each tab will have one or more groups. Some groups will have an arrow you can click for more options.
A workbook is an Excel file that contains one or more worksheets. Each of the workbook&#039;s worksheets are in separate tabs on the bottom of the Excel window. By default, a new Excel workbook will contain three worksheets. key concept of Microsoft Excel is the difference between a worksheet and a workbook. computer image by fotografiche.eu from Fotolia.com. Microsoft Excel is a powerful small business tool that allows you to organize and analyze large amounts of data quickly and efficiently.