Brit is 15-months-old and is on a serious mission to explore his surroundings. his mother is concerned about his exploration of their home because she has noticed that he seems to put everything in his mouth. he bites, chews, and sucks on objects. according to freud, brit is in the stage of development.

According to Freud, Brit is in the oral stage of development.

Explanation:

Freud theorized that there are 5 stages of psychosexual development.

The oral stage is the first one, which goes from birth to around 18 months of age. In this stage, the main point of pleasure is the mouth and it is the way the child learns about the world and his/her surroundings. This is why babies tend to put everything in their mouths.

In this case, Brit is exploring and putting everything in his mouth, biting, chewing and sucking in order to understand the world around him.

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