Marla and aisha both playing with their own dolls in the same area, but they are not talking to each other – only to their own individual dolls. gina and tasha are playing jump rope. the first two girls are engaged in play while the second pair is engaged in play.

The answer is parallel and cooperative, respectively.

Explanation:

Parellel play occurs when children play in the same area as others, but don't interact directly. It differs from associative play because parallel is imitative (i.e. both kids are doing the same activity), and associative involves different types of activities, and a considerable degree of interaction.

Cooperative play is when children are interested in each other's activities, play together and present an organised structure. They usually assign roles (in the example, one of them swings the rope and the other jumps).

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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