The purpose of the tension protractor apparatus is to? (could be more than one answer)

A) demonstrate the use of pulleys with multiple forces.

B) visualize equilibrium on an object under multiple forces.

C) visualize forces by different length of string.

D) demonstrate the vector nature of forces.

a.   mass number from atomic number

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.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.