Six-year-old kian is in the stage of cognitive development, whereas his 10-year-old brother is likely in the stage.

preoperational; concrete operations                

Explanation:

Jean Piaget has given the theory of cognitive development in which he has mentioned four different stages including sensorimotor, preoperational, concrete operational, and formal operational.

Preoperational stage: This is the second stage in the cognitive development theory and starts from the age of two years and lasts through seven years of age in a child's stage. At this stage, a child is being engaged in manipulating symbols and symbolic play.

Concrete Operational Stage: This stage is the third stage and starts at seven years of age and lasts through eleven years of a child's life. In this stage, a child is engaged in using logical operations or thought and therefore the child can put logic only to physical objects.

all people shall have equal rights upon birth and ever after. (when referring to the rights of man the declaration of the rights of man only applied to landowning men who were 25 years or older and paid taxes equal to 3 days worth of work and were not servants.

explanation: hope this