What are the main differences between oogenesis and spermatogenesis. What is the biological meaning of the formation

What are the main differences between oogenesis and spermatogenesis. What is the biological meaning of the formation of a large number of spermatozoa during spermatogenesis?

The main differences between oogenesis and spermatogenesis are as follows;
1) the number of oogonies that have entered the maturation stage is laid at the stage of embryonic development, and spermatogonia begin to actively divide upon puberty, and this process continues uninterrupted;
2) four gametes are formed in the process of spermatogenesis, and only one in the process of oogenesis;
3) the process of oogenesis is finally completed only after fertilization. Biological meaning: A large number of sperm cells increases the likelihood of fertilization, and the nutrients of a large egg ensure the development of a future embryo.

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