Why is the number of offspring of animal species caring for offspring decreasing? Give examples.

In animals with a pronounced care for the offspring, the number of cubs is relatively less than in animals with little concern for the offspring.
Give examples: most species of fish, insects lay a large number of eggs or eggs. Mammals – I carry one or more cubs in the womb and then feed them for a long time.

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.