JJ Thompson discovered subatomic particles, focusing mainly on the electron
I think it's D. Sry if you get it wrong though
<span>The correct answer is b.0.5 to 1 micrometre thick.</span>
Usually, the respiratory membrane is about 0.6 micrometres thick. This membrane consists of the alveolar epithelial cells, the capillary endothelial cell, and basement membranes which are formed by the alveolar and capillary cells.
The answer is stem cells. Normal stem cells and germ cells can also be said to be immortal
I think the answer is liver and hepatic portal vein
Hope this helps
