Answer:D
Explanation: Because it has the least amount of density in it. All the others are heavier, meaning they will sink. Just like if you drop a rock water and a feather, the feather will float.
Density def:
Density, mass of a unit volume of a material substance. ... Density offers a convenient means of obtaining the mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density (M = Vd), while the volume is equal to the mass divided by the density (V = M/d).
Carbon is so important because it’s how living things breath
Answer:
B
Explanation:
because they are moving at the same direction
Mitochondria because it releases stored food which is used for power growth and development and movement..and muscle have the greatest demand for them than any other body cell