What is the fundamental unit of life? Who discovered it? How can they be observed?

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(N/A) $(i)$ The fundamental unit of life is the cell.
$(ii)$ The cell was first discovered by Robert Hooke in $1665$.
$(iii)$ Cells are generally observed under a microscope because they are microscopic in size. However, some cells are large enough to be seen with the naked eye, for example, an ostrich egg.

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Which of the following can be crystallized?

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$(ii)$ How is endoplasmic reticulum important for membrane biogenesis?

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