Why don’t birds lay as many eggs as reptiles?

Because birds fly and it is difficult for them to fly with such a load. Therefore, they lay 1 egg each.
Also, birds’ eggs are less at risk of death than reptiles, which usually bury their eggs in the sand. Any predator can watch for and eat eggs, from a larger number there is a chance for some individuals to survive.

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.