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skelet666 [1.2K]
3 years ago
13

19.2 Choose the correct answer.

Biology
2 answers:
IgorC [24]3 years ago
8 0

the answer is robert hooke . He discovered the cell in 1665 , by viewing a piece of cork under a microscope and found out small room like blocks , he named these block cells .

Stella [2.4K]3 years ago
7 0
Robert Hooke discovered the cell
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The volume of the cube of unknown substance is 27\ cm^3. The length of one side of the cube is 9 cm

<u>Explanation:</u>

As per the formula of mass and density, Mass / Density equals to volume. Therefore as the mass of the cube was given to be 81 g and the density of the cube is known to be 3.0 g/\mathrm{cm}^{3},, to help Bill find out the volume. It is the ratio of mass and density and can be calculated as

      \text {volume}=\frac{\text {mass}}{\text {density}}=\frac{81 g}{3 g / \mathrm{cm}^{3}}=27 \mathrm{cm}^{3}

As it is a cube, the volume is product of length, breadth, and height. Here, all sides are same as it is the cube.

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      length of cube's one side, l=\frac{27}{3}=9 \mathrm{cm}

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