With external fertilization, sperm and eggs are released into the water (i.e., into the external environment), where they merge. A significant part of gametes die from adverse environmental conditions, therefore, in animals with an external type of fertilization (bone fish, amphibians, many aquatic invertebrates), a large number of germ cells are produced. For example, cod swallows about 10 million eggs, and moon fish – up to 300 million.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.