On the other hand, the modern system of classification does not only study the observable features but it also traces the evolutionary line and relationships between organisms to classify them into larger categories or clades.
When women experience cravings for different foods, it means that they experiencing a hormone related change which severely effects their sense of taste and other senses that can cause these kinds of cravings.
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a long whip-like tail used to move and/or catch food. An example of a flagellated protist is the Euglena. Cilia - small hair-like projections on the surface (cell membrane) of the cell used to sweep food into mouth-like structures and/or beat them in rhythm to move.
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Diffusion is simply particles spreading around. Think of it like spraying perfume in a room. Where the person sprayed the perfume would be a high concentration as there is a lot of that perfume there. However, on the other side of the room there would be little to no perfume. So the perfume spreads around until it is evenly distributed in the room.
The organisms who have only a cell wich are called monocellular living things and pluricellular living things.