Read these paragraphs from the text. Even after you're fully grown, your brain will continue remaking itself. Scientists know the brain is a work-in-progress.

They know this thanks to high-tech imaging techniques, such as magnetic resonance imagery (MRI) and positron emission tomography (PET). The MRI snaps detailed pictures of the brain. The PET scan reflects brain activity.

Based on this evidence, what can you conclude about the way scientists study the brain?
The way that the brain remakes itself can be studied through high-tech pictures and scans.
The only way that scientists study brains is by using high-tech imaging techniques, since no other techniques are useful.
The most important piece of high-tech imaging that scientists use is the MRI because it is more accurate than the PET.
High-tech imaging techniques only help scientists see if there is any physical damage to the brain.

fast by juice wrld

explanation:

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