I read Abel's comment, quite helpful. the formation of cells probably made of different items.

is Hooke that first contribute to cell

Biology -> Hooke's microscope Hooke's microscope

'microscope' is optimize in science term adept microscope needy off magnify-glass pencil&paper to usage to conditioning observation or researches to written panel-control also a term of science

how are cells connected to each other ???

Was Hooke the first to see split ends via microscope?

is there any specific number of how long the nerve cell can carry signals?

How often do scientists use microscopes?