The Discovery<span> of Radioactivity. In 1896 </span>Henri Becquerel<span> was using naturally fluorescent minerals to study the properties of x-rays, which had been</span>discovered<span> in 1895 by Wilhelm Roentgen</span>
Answer:
The cell membrane is permeable to small solutes to let them easily diffuse in and out of the cells.
Cementation and compaction
