Answer:
object permanence
Explanation:
In the year 1936 Jean Piaget,a Psychologists proposed the theory of cognitive development in children. Jean Piaget started this theory after he observed his children behaviour and with this he divided the cognitive development in children into four stages which are given below;
===> sensorimotor stage: from the the time babies are giving birth till they are 2 years old. In the stage, Piaget discussed schemata.
===> Preoperational stage: this stage is from 2 years old to 4 years old.
===> Concrete operational stage: is a stage that occurs between the ages of 7 to 10.
===> Formal operation stage: this is the last stage for cognitive development in children. It occurs from the ages of 11 to adolescence.
I think it would be B, because your taking it out of your system
Though I'd only recommend an increase of handywork and skill, Out of the options above, i'd choose to use dull knives.
skeletal system and the muscular system,
Muscles are attached to the skeleton and work assuming that the skeleton is there; for example, there is no muscle that makes sure you don't bend the middle of your arm, as it's stable because there is a bone in it. Basically, the skeleton is a scaffolding for the muscles.
the skeletal system and the nervous system,
Many nerves run along the skeleton, or even inside the bones, and the bones protect the nerves; for example in the spinal cord
the muscular system and the nervous system.
The Nervous system controls the muscles; it sends the muscles commands
