. Adventures with animals and plants. Biology. 96 The Living Thijigs of the Earth unit no Coins 60 Coins. Fig. 126 The diagram shows you something else. The oftener you subdivide, the smaller the mimber of specimens or in- dividuals in each successive grouping. For example, you start with 110 coins but the number of United States coins is only 60. In the next grouping there are 16, 14, and 30. And of the 16 dimes, divided accord- ing to the year they were coined, how many do you count in each pile? Another important fact to understand about every classification is this: the specimens in t
. Adventures with animals and plants. Biology. 96 The Living Thijigs of the Earth unit no Coins 60 Coins. Fig. 126 The diagram shows you something else. The oftener you subdivide, the smaller the mimber of specimens or in- dividuals in each successive grouping. For example, you start with 110 coins but the number of United States coins is only 60. In the next grouping there are 16, 14, and 30. And of the 16 dimes, divided accord- ing to the year they were coined, how many do you count in each pile? Another important fact to understand about every classification is this: the specimens in the first subdivision have few characteristics in common. For ex- ample, the 60 United States coins form a group of considerable variety; they arc alike in two respects only, they are metal coins and thev^ are United States coins. But specimens in the final sub- division have many characteristics in common. For example, the three pennies in the final subdivision are alike in beinir metal coins, of the United States, being made of "copper," having the same size, the same color, the same value, and lastly being of the same age. It should not sur- prise you that this group contains fewer specimens. Thev be matched in many details before they can be fitted into this group. The classification of plants and animals. It is relatively easy to classify stamps and coins. But plants and animals are so much more complex that their classification is much more difficult. More than two thousand years ago the great Greek scientist and philosopher, Aristotle, wrote detailed and accurate descriptions of many animals. In doing this he came to recoonize that certain ones had similar characteristics. For example, he put rep- tiles, birds, and fishes together into one group, the egg-layers. You will remem- ber from Problem i that we no longer classify or group together animals on the basis of laying eggs. We use other characteristics. As biologists continued their studies they found t
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