Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 INFANCY AND PARENTAL CARE 333 of the species, whereas other kinds of doings would probably lead to the extinction of the species. Some plants behaved in a certain way in past ages, and their progeny to-day occupy the surface of the earth. Other plants behaved quite otherwise, and we know of them only by the traces they have left in the ancient rocks of the hills. Fig. 157. The four-spined stickleback (Apeltes quadracus) The adult fish swims about and through t
Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 INFANCY AND PARENTAL CARE 333 of the species, whereas other kinds of doings would probably lead to the extinction of the species. Some plants behaved in a certain way in past ages, and their progeny to-day occupy the surface of the earth. Other plants behaved quite otherwise, and we know of them only by the traces they have left in the ancient rocks of the hills. Fig. 157. The four-spined stickleback (Apeltes quadracus) The adult fish swims about and through the nest, guarding the eggs while they are hatching 387. Infancy among animals. When we study the pro- longation of infancy among animals, we find that the advan- tages of a protected and cherished youth are even more marked there than they are among plants. Among most of the lower animals the mother lays large numbers of eggs — in the water, on leaves, in the soil — and abandons them. But toward the upper end of many series of
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