Fill in the following blanks with suitable words: (a) Cells were first observed in cork by ___ in 1665. (b) What is brick to a house is ___ to an organism. (c) The cytoplasm and nucleus make up the ___. (d) The shape and size of a cell is related to its ___. (e) The bacteria cells are ___ to ___ micrometre in length. (f) The smallest unit of life is a ___. (g) Tissues make up ___. (h) Organ systems make up an ___. (i) Cells make up ___. (j) Organs make up ___.