What tool first allowed scientists to study cells?

Microscope

Robert Hooke's Microscope. Robert Hook refined the design of the compound microscope around 1665 and published a book titled Micrographia which illustrated his findings using the instrument.

Explanation:

Hey i actually know this! haha only cause i did it.

its a Microscope.

and im pretty sure hooke was the first to discover!

Explanation:

brainliest?

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.