. Biology and human life. Biology. 486 BIOLOGY AND HUMAN LIFE 357. Water essential to gametes. As we have seen, sexual reproduction means the union of two gametes. In addition te producing gametes, bringing them together is another problem of life. Moreover, the sperm and the egg cells (gametes) are unlike spore cells in that they are quite incapable of resisting. Fig. 204. The four-spined stickleback (Apeltes qiiadraciis) The adult fish swims about and through the nest, guarding the eggs while they are hatching drought; drying kills them very quickly. A condition essential to reproduction is
. Biology and human life. Biology. 486 BIOLOGY AND HUMAN LIFE 357. Water essential to gametes. As we have seen, sexual reproduction means the union of two gametes. In addition te producing gametes, bringing them together is another problem of life. Moreover, the sperm and the egg cells (gametes) are unlike spore cells in that they are quite incapable of resisting. Fig. 204. The four-spined stickleback (Apeltes qiiadraciis) The adult fish swims about and through the nest, guarding the eggs while they are hatching drought; drying kills them very quickly. A condition essential to reproduction is that the gametes be protected against drying up. Among organisms that live on land or in the air the older methods of bringing the gametes together can no longer serve. We have seen how this condition is met in the flowering plants. Among land animals there are special organs and modes of be- havior that make fertilization Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company
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