Which microscope did robert hooke use to study tree bark?
electron microscope
compound light microscope
simple microscope
scanning microscope

The right answer is Compound light microscope

Robert Hooke is one of the first scientists to build and use a compound microscope, a multiple lens assembly, usually three in number: an eyepiece, a field lens, and a lens. He gives many tips for the manufacture of microscopes manufacturer Christopher C-o-c-k. But this attribution seems inaccurate, because Zacharias Janssen had already built similar microscopes in 1590. Nevertheless, the Hooke microscopes reached a magnification of 30 times, which was much superior to the previous instruments.

The correct answer is option B

Robert Hooke made a compound microscope which he used to study the bark of a tree.

This new compound microscope had a mechanism of screw operated focusing which was designed by him. Previously the whole specimen was moved to get the focus on it.

But now with the help of this compound microscope there was no need to move the specimen for focusing on it.

it marks things for degradation via the proteasome. it alters there celluar location.