Explain how the muscles in your arm work together to make your arm move.

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes

What type of reaction is photosynthesis

Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?