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Alex
3 years ago
13

Help! I will give brainliest .

Biology
2 answers:
Elena-2011 [213]3 years ago
8 0
Organ Brain is in the nervous system

Organ Heart is in the circulatory system

Organ lungs is in the respiratory system

The heart is the organ that supplies blood with oxygen.

This is all I know :)

Mumz [18]3 years ago
7 0
This is a very easy thing lll
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Bill has a perfect cube of an unknown substance. The density of the substance is 3.0 g/cm. He
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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.

        volume= length \times breadth \times height

       27=3 l

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

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