I think the second option is the best (by making the ramps height and length equal) because the first option will require more pushing, the third option will only make the ramp lighter which could cause it to not stay in place, the last option would make it harder to push the boxes up because the rubber will make it harder to slide the boxes up. I hope this helps:)
Carbon dioxide is released. Here is a diagram...
An increase in genetic variation
Explanation:
<u>(</u><u>Ans - </u><u>4</u><u>)</u>
(a) 1000 kg/ m^3
(b)
1) sink
2) float
3) sink
4) just float
(c) New density = 2 g/cc since both mass and volume of rock are halved.
(d) Ice floats because water in solid state undergoes hydrogen bond formation, which reduces its density and it starts to float.
