Juan and his little sister, Anne, are each given a large cookie. Their mother breaks Anne's cookie into four pieces to enable her to eat it easily. Juan immediately begins to cry and says that it is not fair that his sister got more cookies than him. Juan is showing a lack of:

A. constancy.

B. conservation.

C. intuition.

D. symbolic function.

Conservation

Explanation:

Conservation term was introduced by Jean Piaget in his theory of developmental psychology. This term comes in the third stage of the cognitive development stage which is called for its rational thinking and organization.

Conservation is the term that defines when the same quantity is there even if there are the shape, size, and volume has been changed. This has happened around seven-year-old children.

Juan and his little sister Anne are on the third stage of the cognitive-developmental stage. In this stage conservation procedure occurred with theses children.

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals