For the book on the table what is the name of the force that is pulling the book down?
A. Tension B. Gravity C. Normal Force D. Support Force

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

k2s for potassium sulphide